This guide consists of two parts:

Part 1 - 100% map completion
All maps completed. There are a lot of collectable items in the game and most of them can just be picked up if you know where they are (red dot on the map). In some cases however, they are quiet hard to collect even if you see them. This guide will provide completed maps for all regions and mini guides for really tricky items to help you finish your 100% run. I will not cover items that can be reached by simple exploration like cracks and gaps in the wall, so let me know if there are any other items you are struggling with and I'll do my best to help and add more items to the guide. I recommend to get all your abilities (Down Smash, Cat Tumble, ect.), get a few useful accessories and level your dash ability before attempting to 100% the map.

Recommended accessories for map completion:
Catcoin Detector
"Generate aura stream when Nyaruru is close to a hidden treasure."
Equipping this accessory makes a glowing symbol appear above Nyarurus head whenever treasure is near. This makes completing the map much easier because now you know where all the items are on the map and you will be notified when you get close to them. You can buy this accessory from the vending machine for 900 coins.


Fish Baking Powder
"Nyaruru's fish can attack the terrain. When approaching impassable terrain or hazardous terrain, this accessory will become temporarily ineffective."
Being able to attack the terrain, basically means you can use your cat tumble to tumble on the floor, up the wall and even along the ceiling. With this, some hard to reach items can be collected much easier. You can buy this accessory from the vending machine for 900 coins.


Part 2 - All achievements
Some achievements are story related and will be collected automatically while playing through the game. Others require specific actions at certain moments and can easily be missed. If you are worried about missing something or simply don't know how to unlock an achievement, this guide will provide a walkthrough so all achievements and endings can be obtained in a single playthrough.

 
Collection: 1
Exploration: 17
This cat coin is not shown on the map because it's the same square as the save point. It can be collected at any time by double jumping and dashing from the teal colored roof (Berries shop).

 
Collection: 39
Exploration: 76

Item 1 (Cat Scratcher & Gold Cat Coin)
Use the bouncy mushrooms to get the crate to the other side of the pit. Use the crate to jump into the gap in the ceiling and Cat Tumble across to collect the first item. Afterwards, another item can be collected by sliding down the right wall of the pit.

Item 2 (Cat Scratcher)
Push the bouncy mushroom into the other one to bounce it into the gap. Follow and dash to the right to collect the item in the top right corner.

Item 3 (Pile of coins)
Up Attack the bouncy mushroom to fling it upwards and then hit it from the side to push it onto the next ledge. Enter the next toom to collect a pile of coins.

Item 4 (Diamond)
Get squished by the boulder and time your dash to get through the gap.

Item 5 & 6 (Silver Cat Coins)
For these 2 items you have to get squished and find the gap in the wall. For item 5, the boulders drop right above the pit. Get hit, jump down and find the gap. For item 6, get squished in the room to your right, run back and slide or jump into the gap. Alternatively you can do a crouch jump to get into the gap by holding Crouch + Right. Then press Attack and Jump while you are in your attack animation.

 
Collection: 2
Exploration: 21

The one at the top can be collected by wall jumping up the wall and dashing or jumping towards the middle.
 
The one on the left can easily be reached while getting the Yakcat Tower achievement but don't worry if you missed it. You can collect it any time after beating the boss Above the Clouds. Just enter the boss arena again and fall all the way down to Magic School. Glide to the left and dash if necessary to collect the gold Cat Coin.

 
Collection: 35
Exploration: 58

Item 1 (Diamond)
Use the air leak to reach the ceiling and dash to the left. Cat Tumble or Down Attack the stalactite to gain height and keep dashing to reach the next one, until you get to the item.
If you have the Fish Baking Powder accessory, you can just Cat Tumble along the ceiling as I do at the end of the video.

Item 2 (Gold Cat Coin)
Place the crate on the left platform, jump up to the other platform and lower it. Now wait for an angry yak cat to get pushed onto your platform, jump back to the crate and put it in position to jump up to the item.

Item 3 (Gold Cat Coins)
Some items in the final part of the crystal cave are too high up to reach them. Jump from the back of a yak cat or use the air leak in the ground to collect them.

 
Collection: 33
Exploration: 93

Item 1 (Cat Scratcher)
Push a turtle into the bubble stream. If it gets stuck on the first edge, slowly walk into the stream and carefully wiggle your way into the gap to collect the item. The intended way is probably to use 4 turtles but this worked pretty consistently. If you end up getting stuck at the top underneath the turtle, hold right and spam jump until you are free or kill the turtle.

Item 2 (Gold Cat Coin)
Pick up the first turtle from the room below and move it up to the gap in the ceiling. Then get the second one from the room to the left and push both into the bubble stream.

Item 3 (Pile of coins & Cat Scratcher)
There is a third spot where you have to stack turtles to get past a bubble stream and reach the room to the right. This one requires 4 turtles and they can be found right above in the same room. Dash into the stream so you don't get stuck.
 
Item 4 (Gold Cat Coin, Cat Food & Cabbage)
There is a hidden room (4.1) to the right of the teleporter, that can be entered from the top and has a lock system inside. Attack the numbers in the correct order to open the gate. The code can be found in a different sqare on the map (4.2) but if you don't wanna go back just to check, the code is 334212

 
Collection: 31
Exploration: 95

Item 1 (Diamond & Silver Cat Coin)
Jump from the moving cloud and dash through the first gap. Land on the moving cloud and duck to get through the second gap. Jump into the third gap and land on top of the pillar. Jump and dash into the stationary cloud and Cat Tumble to gain height. If you have enough stamina you can ignore the moving cloud now and just dash to the other side after passing the last barrier. If not, you will have to land on the moving cloud again. Don't forget to grab the item inside of the wall before you go back.

Item 2 (Cabbage, Silver Cat Coin & Cat Food)
Climb up the wall to gain as much height as possible, Dash Jump to the right and keep dashing whenever possible. If you have enough stamina you can reach the clouds and just Cat Tumble to the other side. If you haven't maxed your stamina yet, you can use the Fish Sword Draw ultimate ability to gain more distance.

Item 3 (Diamond)
Bounce off clouds to stay in the air and use your dash, jump and glide to reach the next cloud. Down Attack and Cat Tumble both work but using Cat Tumble is much easier.

Item 4 (Gold Cat Coin)
Use the clouds and walls to climb up before the elevator reaches the top.

 
Collection: 45
Exploration: 100

Item 0
There is a crack in the wall. Hit the wall to reveal a gate and enter to access the upper area where Lily is.
 
Item 1 (Silver Cat Coin)
Lure both rats to the left so one of them jumps up. Let it attach to you and jump down the hole. You are now heavy enough to reach the ground. Kill the rat to go back up.

Item 2 (Cat Scratcher)
Wait for the Eye to spawn above you and redirect the attack. It will now travel up and you can Cat Tumble on top of it to reach the ceiling. Jump off and dash to reach the item.

Item 3 (Gold Cat Coin)
There is a hidden entrance in the ceiling, making it easy to grab this item. Cat Tumbling along the ceiling with the Fish Baking Powder accessory helps a lot here, otherwise a well timed jump while dashing does the trick.

Item 4 (Silver Cat Coin, Gold Cat Coin & Cat Scratcher)
Glide through the gap with spikes on the top and bottom while tapping the left key or wiggling your control stick to the left. That should give you just the right amount of speed, if done correctly. Don't forget to jump up and collect 2 more items.

 
Collection: 43
Exploration: 63

Item 1 (Cat Scratcher)
Start on the small platform on the left. Crouch and spam dash to get into the gap. Now just carefully walk off the edge and hold jump to glide down and collect the item along the way.

Item 2 (Cat Food)
Slide down the wall, to get squished by the metal ball. If you have the Fish Baking Powder accessory, you can just Cat Tumble along the ceiling to reach the item. Otherwise use the top path after getting squished and slide through the gap on the right. Slowly walk into the hole with the item.

Item 3 (Gold Cat Coins)
There are a lot of ways to get squished so I'm just showing you examples. You can copy them or find your own way to get squished. For me, slowing down the metal ball on the left so they meet in the middle, was the most consistent way on this floor. Get squished, run back to the hole on the left and drop down to collect both items.

Item 4 (Gold Cat Coin)
You do the same thing on the right side of the tower. Find a way to get squished, run back and collect the item.

Item 5 (Gold Cat Coin)
And another one. The metal balls can get offset or stuck so these might look a little different for you. Try to manipulate them the way you want by slowing them down or just reset the area.

Item 6 (Silver Cat Coin)
For this one you let the metal ball drop on your head while sliding down the wall. There is another item inside of the wall, right above this one. You can leave the tower at the top left and slide down the wall of the tower to find an opening.
 
Item 7 (Cat Scratcher & Diamond), 8 (Accessory: Twin Blade Knife) & 9 (Cat Food)
There are 3 conveyor belt puzzles in Floating Tower. The first one is right below the save point (7). Hit the first lever at the bottom and climb up to the save point. Skip this lever for now and drop down into the spike area. Dash to avoid the spikes and hit both levers. Next dash to the right and climb up to the top of the conveyor belts. Collect the first item next to the crate and hit the lever from below, by Up Smashing into the ceiling. Follow the flow of the conveyor belts all the way down, wait for the crate and use it to reach the item.

The second conveyor belt puzzle (8) is much easier. Hit both levers to reverse the direction of the conveyor belts, then look up and you will see a crate right above the first conveyor belt. Push it onto the first conveyor belt and jump down. Now you can jump from the crate to collect the item.
 
For the third conveyor belt (9), just Up Smash into the ceiling to flip the lever and collect the item.

 
Collection: 42
Exploration: 79

Item 1 (Cat Scratcher)
Hold Crouch and Right. Now Attack and Jump while you are in your attack animation. This way you can perform a crouch jump and fit into small gaps you normally can't enter. Get on top of the button to release Medusa Cat. Leave quickly and lure Medusa Cat to the other side of the room. Dash and Cat Tumble on top of Medusa Cat to reach the item in the corner.

Item 2 (Arcade Coin)
Jump into Medusa Cat and get petrified right above the spike elevator. The air leak in the wall takes care of the rest.

Item 3 (Cat Bell)
One of the hardest items to get but it's a Cat Bell so it's worth it. For this method you need the Fish Baking Powder accessory (not sure if you can do it without). Enter the room and look at Medusa Cat. As soon as Medusa Cat leaves the screen, wait a few seconds (5-6 works for me) and Dash Jump to the left. Dash a few times to catch up to Medusa Cat while gliding and start Cat Tumbling as soon as you reach her. Jump after each tumble so you don't accidentally kill her. Cancel your Cat Tumble by dashing or attacking and dash or fall into Medusa Cat to get petrified right above the spike elevator. Don't jump into her because you will need your jump later. Take the elevator all the way up, then jump up to the next screen and instantly start Cat Tumbling again. Having Lily with you might help because you can tumble on her head. You should be stuck to the ceiling now and can tumble to the right to collect the bell.

Item 4 (Gold Cat Coin)
Wait for Medusa Cat and jump into her to get petrified right above the spike board.

Item 5 (Cat Scratcher, Accessory: Firecracker & Pile of coins)
An easy way to get this one is equipping the Mini Black Hole accessory. Stand on the button and hold attack to pull the crate down. Then just place it on the button and jump up. Alternatively you can place Lily in active mode on the button and jump off her head.

Item 6 (Gold Cat Coin)
Crouch Jump to get into the gap. Hold Crouch and Right. Now Attack and Jump while you are in your attack animation. See Item 1 for a video example.
 
Item 7 (Cat Food, Cabbage, 2 Gold Cat Coins, Pile of coins & Cat Scratcher)
Jump on the spike board to get rid of it without activating the actual elevator. Now slide into the gap in the wall and collect all items. Slide down when you are finished and collect more items at the bottom.

 
Collection: 22
Exploration: 75

Item 1 (Cat Catcher, 2 Cat Scratchers & Cabbage)
Cat Tumble on top of the yellow projectiles to reach the hole in the ceiling. Now you can use the big purple crystals and the Power Jump to tumble all the way up. Enter the next room at the top and collect the first item. Use the black flowers projectiles again to tumble up and jump over the death crystals to the left. Collect the second item on top of the previous room.

Item 2 (Cat Scratcher & Accessory: Blade of Wind)
Collect the Power Dash, jump and dash left to collect the Power Jump on the other side of the death pit. Turn around mid air to come back. Now use the Power Jump to reach the platform above for the first item (2.1) and make sure you collect the Power Dash again, either before or while jumping up. Jump and dash from the platform and time your jump to get into the gap and collect the Blade of Wind accessory (2.2).

Item 3 (Diamond)
Get the Power Dash in the room to your left and use it to reach the first wall. Climb up the wall and jump or tumble over the crystals. Slide down, jump and dash into the Power Jump. Jump again and hold the jump button to gain as much height as possible. Start Cat Tumbling when the purple crystal is in reach. Jump and use the Power Jump to get to the wall on the right. Dash if necessary. Stay on the wall for a moment to get your double jump back and wait for the Power Dash to recharge. Dash into the Power Dash so your next dash will be empowered aswell and go back to the left to collect the Power Jump again. Turn around, cancel your Power Dash with an attack and dash again on the lower path. Drop down at the end, dash and finally use your Power Jump to get the item.

 
Collection: 28
Exploration: 82

Item 1 (Cat Scratcher & Diamond)
Hit the gravity staff to go up side down (1.1) and run back to get the first item (1.2). After that break the wall by smashing into the ground and continue to the left to find 3 hidden rooms. You can Cat Tumble on these crystal spikes but I think it's much easier to just deal with up side down controls. After the third barrier, you can just dash across and collect the item in the last room (1.3).

Item 2 (Cat Scratcher & Pile of coins)
Wait for Snowball Bro to throw a snowball, dodge it and then dash to the right, into the snowball. After that, hit the gravity staff and continue up.

Item 3 (Gold Cat Coin)
Go up side down (3.1) and go back to the item (3.2). Knock Snowball Bro down, next to the spikes. Wait for him to throw a snowball and dash into it.

Item 4 (Arcade Coin & Accessory: Force Field)
Collect the fish, try to catch a snowball and hope for the best. If the cats feel like cooperating they will push you all the way through. Collect the first item and break the wall to reach the hidden room.

Item 5 (Cat Scratcher)
Collect the fish, Cat Tumble on top of the cats and hope they push you up to reach the item.

 
Collection: 36
Exploration: 51

Sea of Stars is a weird area. The entire map is one big square, making it really hard to navigate because you can't tell which parts of the map are connected. Some items are just out in the open, free to be picked up, but most are behind a barrier. These can be separated into 3 groups:

Breakable by fish
This type of barrier can be destroyed with a fully charged attack. Press and hold the attack button for a few seconds to perform a charged attack.
 
Breakable by energy ball
This type of barrier looks similar to the first one but can't be destroyed with an attack. To break it, the enemy that looks like a canon on wheels has to hit it with an energy ball attack. These blue energy balls are homing in on you and explode so it's not that hard to make them shoot the barrier. Just move the camera around and look for one of these guys. If they are out of range, you can push them without damaging them by equipping the Blade of Wind accessory.
   
Breakable by wiggly laser
By far the worst one. To break this barrier, you have to redirect one of the wiggly lasers into it. Some of them are pretty far away and you have to redirect them multiple times. You can use attacks or up and down smashes to redirect them. I don't think adding a video for each of them is gonna be of much help because you know what to do. The hard part is actually pulling it off. Let me know if there is one that's giving you trouble but for now, I'm just showing you one of the harder ones as an example.
 
Item 1 (Diamond)
I start off by attacking it from the right to redirect it to the left. I move ahead and Down Attack to redirect it again. I move to the right and Down Smash, move left and Down Attack and then Down Smash again to redirect it 3 times in quick succession. For the final hit, I Up Attack to redirect it into the barrier.

 
Collection: 35
Exploration: 80

Item 1 (Gold Cat Coins)
These are the same barriers we already encountered in Sea of Stars but this time we use the energy balls shot by Green Maid to destroy them. Wait for the attack to get close to you and Up Attack to redirect it towards the barrier. Now hit the carrot elevator and travel up to collect the item. Do this on the right side (1.1) and again on the left side (1.2). Check item 8 for a video example.
    
Item 2 (Cat Scratcher, Silver Cat Coin & Gold Cat Coin)
You can Cat Tumble upwards on moving blue walls. Wait for it to get close, then jump and start tumbling. Use this to collect all 3 items close to the ceiling. Alternatively you can use the carrot elevator on the left and dash across or use the Fish Baking Powder to tumble along the ceiling.

Item 3 (Cat Scratcher & Gold Cat Coin)
You can collect these items when you drop down the middle path of the map and land on top of the first cube on the right. From here just crouch and dash to slide along the ceiling. But you can collect them much earlier by doing a Crouch Jump to get on top of one of the other cubes. To do a Crouch Jump, hold Crouch and Right/Left. Now Attack and Jump while you are in your attack animation.

Item 4 (Gold Cat Coin)
I don't know how you are supposed to enter the laser box but with a little bit of practice, a Crouch Jump works. Start on the blue platform to the right. Crouch, then press left or move your control stick to the left. At the same time attack, then jump, then start dashing (I just quickly slide my thumb from X to A to B on the controller). You can do the same thing to get out of the box. If you hit the metal box above the laser, you start dashing too late. You can see it happen to me on my way out.

Item 5 (Gold Cat Coin)
Start on top of the rightmost box, crouch and start dashing to get in. If you don't touch the ground, you will respawn on top after collecting the item and hitting the laser. If you touch the box on the left, you will respawn here and can only get out with a Crouch Jump.

Item 6 (Diamond)
Touch the electric cables on the left side of the map to gain super speed. Double Jump to the right and start dashing but don't spam. You gain a lot of distance with a single dash so try to space them out, otherwise you will run out of stamina along the way. Important: use the auto save point on the bottom floor before attempting this!. If you run out of stamina or electricity and touch the laser, you might get stuck in a respawn loop on top of the laser. If that happens, load your auto save from the menu and try again. If you don't save right before, you will have to redo everything you did after your last save.

Item 7 (Gold Cat Coin & Cat Scratcher)
For these 2 items, hit the first lever once and the second lever three times. Bounce across and get on top of the box, then crouch and spam dash to collect the first item. Now hit the third lever once and jump onto the spring to collect the second item.

Item 8 (Gold Cat Coin)
Get on top of the rightmost box and wait for Green Maid to shoot her energy balls. Jump and Up Attack to redirect the energy ball into the barrier. Now that the item is free, you can Cat Tumble on her head and on her attacks to get enough height to collect the item. Alternatively, there is another electric cable further down. Touch it and use your super speed to Up Smash all the way to the item.

Item 9 (Gold Cat Coin)
For this method, you will need the ultimate ability Fish Shock Wave. It hits everything on screen, including carrot elevators, so we can use it to call the carrot elevator without attacking it. If you don't have and don't wanna get Fish Shock Wave (you can buy it from the vending machine for 1500 coins), you will have to do it the hard way. Attack the carrot directly and climb up before the carrot passes you. Either way, use the carrot elevator to collect the item.

Item 10 (Gold Cat Coin)
Same as before. Redirect Green Maids attack to break the barrier. This time you have to redirect it twice, making it much harder. Collect the item after breaking the barrier.

Item 11 (Pile of coins & Cat Scratcher)
Hit the lever once and use the springs until you get to the last one. Instead of using the last spring, drop onto the metal at the bottom of the blue barrier. Slowly walk off, then dash and jump into the gap. Collect one item in this room and another one in the room to the right.

Item 12 (Arcade Coin & Silver Cat Coin)
To collect these 2 items, drop down to the spring and hit the lever three times. Now use the spring to jump all the way back up and collect both items.

Item 13 (Cat Scratcher & Cat Catcher)
Hit the lever twice. The easiest way to do this is by holding up and double tapping Up Smash into the metal box, while taking the carrot elevator. If you miss it and the spring is not pointing upwards, just go again and hit it again. Now jump on the spring and collect both items.

 
Collection: 16
Exploration: 50

Item 1 (Pile of coins & Cat Scratcher)
Use the different levels of terrain to Double Jump up into the gap and collect a pile of coins. After that, keep moving to the left, slide down the wall and instantly start dashing as soon as you can clear the spikes. Jump to get into the gap and use wall jumps to collect the Cat Scratcher.

Item 2 (Accessory: Prism Crystal)
I think the intended way to do this is to break the floating crystal on the first turn, dash left a few times and start Cat Tumbling on top of the flower. The flower will grow after a few seconds and give you enough height to reach the next flower with your Cat Tumble. For me, it was much easier to just use the first floating crystal all the way up. It requires a little precision work but if you line it up as I did in the video, you should be able to get it in a few tries. Either way, float all the way up to collect the Prism Crystal accessory.

Item 3 (Cat Scratcher)
If you can somehow collect the Cat Scratcher and hit the spikes without touching the ground, you will respawn at the top. If you touch the ground however, you will be stuck down here. The first way to get out, is equipping the Fish Backing Powder accessory and Cat Tumble on the ceiling where the spikes end. Alternatively, knock the Spike Shooter down to the lower floor before getting the Cat Scratcher. Now you can escape by using your Cat Tumble on top of the Spike Shooter and its projectiles. The Arcade Coin on the left side of the room can be collected without trouble. You will just respawn at the top after touching the spikes.

Item 4 (Diamond)
Drop down and land on top of the Shield Ball. You can only stand on top of the Shield Ball while it's shielded so you will have to use Down Attacks to stay in the air until it shields up again. Position yourself on its right so it starts moving towards the floating crystal. Enter the crystal as soon as it's in reach and float upwards. Touch the spikes to exit the crystal and dash to collect the Diamond.

Item 5 (Cat Scratcher)
Use the Spike Shooters projectiles to Cat Tumble up to the platform and collect the Cat Scratcher.

This part is a simple step by step guide to get all achievements and endings in a single playthrough. I will skip all story related advancements and hide all boss names behind spoiler tags to keep it as spoiler free as possible. The order of bosses can be checked in the boss tab in the menu. If you are looking for a specific achievement, just scroll down until you find it. You only have to start a new playthrough if you missed one of the missable achievements and didn't create a separate save file before the missed achievement.

Start a new game and follow the main quest until you get to Lily's house.

Stealing money is not good - Part 1                                                                          
Return the stolen money back to Lily.

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This achievement can be missed!

There will be a drawer in the left corner of the house. Interact with the drawer and take the coins. The achievement is not gonna unlock just yet but with this, you are prepared to collect it later.
 
Continue the main quest until you get to the Dark Forest.

How can you sleep like this?                                                                                     
Fall asleep while being squashed.

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This achievement can be unlocked anytime!

This is the first opportunity to unlock this achievement but it can be collected at any time in any region.
While progressing through the Dark Forest, you will encounter multiple spots with falling boulders. Just get squished by one of them and die ("sleep") while you are squished.

Continue to the first boss fight.

Best friends                                                                                                                 
Get hit in the head by Lily's frying pan.

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This achievement can be missed!

While fighting the first boss of the game (Lily), get hit by her frying pan attack and the achievement will unlock. If you missed it, you might be able to unlock it later in boss rush mode or while getting the "A timid cat" achievement but since I already got the achievement, there is no way for me to test if it actually works.

Defeat the second boss (Tangerine).

Beautiful night                                                                                                            
Enjoy the beautiful starry sky with Lily on the rooftop.

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This achievement can be missed!

After defeating the second boss (Tangerine), Lily will start following you. Don't use the menu to teleport back to town. Together with Lily, run all the way back to the teleporter and teleport to Magic School. Enter through the main gate and go up until you get to the balcony. You will unlock the achievement and a CG after their dialogue. This has to be done in the first night.
 
Go back to Moew Town with Lily.

Stealing money is not good - Part 2                                                                          
Return the stolen money back to Lily.

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This achievement can be missed!

After going back to town, Lily will go home to sleep. Follow her and return the coins you took earlier. This will unlock the achievement.

Yuri's Rabbit Doll - Part 1                                                                                           

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This achievement can be missed!

Enter the Dark Forest in the first night. You will find a rabbit doll lying on the ground in the marked location. Approach the doll to start a short dialogue. There will be a second doll later in the game but I think either one unlocks the achievement. It's still worth checking it out for a little background story. This doll only appears in the first night.
 
Sleep to end the first night, then continue the main quest until you defeat the fourth boss (Berries).

Yuri's Rabbit Doll - Part 2                                                                                           

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This achievement can be missed!

After defeating the fourth boss of the game (Berries), the second night will begin. This time go back to Lake Clarice and you will find the other rabbit doll in the marked location. Approach it for another short dialogue. This can be skipped if you already got the achievement from the first doll.
 
Continue the main quest and enter the labyrinth

A timid cat                                                                                                                        
Run away alone in the battle with The Eye of Plague.

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This achievement can be missed!

Making your way through the labyrinth, you will run into the fifth boss (The Eye of Plague). Use your Cat Tumble to get on top of the boss and dash to the other side to get behind him. Now run away and leave the room to unlock the achievement and witness a cute little interaction.

Continue to the sixth boss fight (Nyarutoru).

Master is the best                                                                                                            
Her arms were so reassuring...

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This achievement can be missed!

When encountering the sixth boss (Nyarutoru), you don't have to fight her. Just wait for the bar at the bottom of the screen to fill up. A huge teddy bear will spawn on the left side of the arena and 2 rabbit dolls will spawn on the right side. Attack the teddy bear's head and one of his eyes will drop down to the ground. Attack the eye to push it all the way to the other side of the arena, into the rabbit doll. Repeat for the other eye and the boss fight will end. Now walk towards your master and the achievement will unlock.

Continue the main quest until you get to the Frozen Plateau.

A new sleeping position                                                                                                  
Fall asleep upside down.

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This achievement can be unlocked anytime!

Once you reach the Frozen Plateau, hit one of the gravity staffs to go up side down and die ("sleep") like this to unlock this achievement.

The price of greed                                                                                                            
Calico cats are not happy with their stolen snack.

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This achievement can be unlocked anytime!

In the later parts of the Frozen Plateau, you will find a collectable fish item surrounded by a bunch of cats. Collect the fish to anger all the cats and unlock this achievement.
 
Continue the main quest until you unlock the teleporter in the Sea of Stars.

Wanna to play acrobatics?                                                                                              
Enter an area without a ceiling when inverting.

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This achievement can be unlocked anytime!

Since you just unlocked the teleporter in Sea of Stars, this is a good opportunity to backtrack. This can be done later though. Buy the Fish Shock Wave ultimate ability from the vending machine for 1500 coins and go to the marked location in the Frozen Plateau. After they changed the map, this is the only location I know, that still works. Stand below the opening and jump. Use Fish Shock Wave in mid air, as soon as your head is in front of the rocky background. Fish Shock Wave will hit everything on screen, including the gravity staff so you will enter the room above with up side down gravity. Afterwards you can use the menu to travel back to town and use the teleporter to go back to the Sea of Stars.

Continue the main Quest. At the end of Theia's Laboratory, a prompt will pop up and inform you, that teleporters will be disabled if you continue. You will be able to explore freely after finishing the game so there is no need to go for 100% completion yet but make sure to get the following achievement before you continue.

On the Back of Yakcats                                                                                                   
Reach the top of the yakcats tower

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This achievement can be missed!

I'm not sure when exactly this yakcat tower spawns but it will be gone after finishing the game. It spawns right next to Magical School and can be reached from the small balcony above the place where you watched the stars with Lily. The top two yaks are slightly offset so just land next to them and Double Jump to the top.
 
Enter the 12th boss fight (Theia 2).

Lily's mocking                                                                                                                  
If you're defeated by Theia…

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This achievement can be missed!

For the last normal achievement, simply die once while fighting (Theia 2).

This game has 4 endings. 2 bad endings, 1 ending that's not really an ending and one true ending. When you reach the end of the Broken Labyrinth, there will be an area with all the things you need (teleporter, vending machine, save point, ect...). Create a separate save file so you can go back any time. You will be able to unlock all endings from this file in whatever order you like but I recommend to save ending 3 for last.

Ending 1
In the final fight, wait for the bar at the bottom of the screen to fill up. A rabbit doll will spawn in the middle of the arena and you can interact with it to make a choice. Select "Focus on the Present" and defeat the boss (The Plague Witch/Irin) to unlock ending 1.

Ending 2
Wait for the rabbit doll to spawn but this time select "Accept the Past". Defeat the boss (Yuri). She will be unconscious, sitting on a bench. Use your ultimate ability or Lily's Secret Bomb accessory to damage her and start phase 2. Defeat her to unlock ending 2.

Ending 4
This time, instead of starting the final boss fight, teleport back to the first labyrinth. Run all the way to the left side of the map, where you fought the boss earlier (Spirit Lily). Someone will walk past you. Follow her back to where you first met Irin. Enter the crystal to unlock ending 4.

Ending 3
Enter the final boss fight one more time. Select "Accept the Past" and defeat the boss (Yuri) but this time, don't attack her when she falls unconscious. There will be a hole in the ground on the left side of the arena. Drop down and beat the boss (Nyakori, then finish The Plague Witch/Irin) to unlock ending 3.

After ending 3, you can come back to the boss room to pick up an item. Use it to get more backstory and some reasoning behind her actions.
If you don't know what to do with the item: Go back to Magic School, up the elevator and enter Sakura's room. Use the key to open the box in the top left of the room.

After finishing the game, the last thing you have to do is get all boss rush achievements. Defeating a boss on a certain difficulty, rewards you with the corresponding amount of stars. 1 star on easy, 2 on normal and 3 on hard. On expert difficulty, the base reward is 3 stars aswell but you can earn up to 2 additional stars for not using a heal item and not taking any damage. Those stars only count if you get them in boss rush mode. Your battles from playing the story or practicing next to the actual boss rush do not count, meaning you have to beat all bosses back to back without restocking on heal and buff items. You get a full heal after boss 5 and 10 though.
There are 15 bosses in boss rush so defeating 10 of them with 3 stars (hard difficulty) and the remaining 5 with 4 stars (expert difficulty without healing) is one way to get 50 stars and unlock all boss rush achievements.

Long journey                                                                                                 
Complete the Boss Rush.

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This achievement can only be unlocked after beating the game once!

Complete the Boss Rush on any difficulty.

Glory of cat                                                                                                   
Rated 30+ stars in Boss Rush.

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This achievement can only be unlocked after beating the game once!

Complete the Boss Rush with more than 30 stars.

Aura of cat                                                                                                   
Rated 40+ stars in Boss Rush.

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This achievement can only be unlocked after beating the game once!

Complete the Boss Rush with more than 40 stars.

Cat goddess                                                                                                 
Rated 50+ stars in Boss Rush.

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This achievement can only be unlocked after beating the game once!

Complete the Boss Rush with more than 50 stars.

Thanks for reading my guide, I hope you got some useful information out of it. Let me know if there are any errors, an item you want me to add to the list or just tell me what part of the guide helped you to 100% to game.