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Difficulty: 8/10 (The achievements are not grindy or anything complex. The game itself is very challenging and NG+ is even more brutal)
Duration: About 30+ hrs (Depends heavily on your skills - can also take up to 60 hrs)
Missibles: Too many.
Playthrough: You will need at least 2 playthroughs
NG+: Yes

In order to get every achievement in the game, you HAVE to finish the game twice. That means first playthrough and then the NG+ playthrough. The good news is that you'll most likely get almost all achievements on your first playthrough except for 3. And the last 3 are "easy" to get. The 2 bad news are: A ton of achievements are missable and the game is also very challenging. In NG+ the game is even heavier in regards to it's difficulty regardless of your gear and level.

Thanks to @amitaicuphead for the question: What if you cant backup and reload your save because your not playing on PC?
In that case you will have to complete the game 3 times, instead of 2. You would first go the "Lie"-Run choosing "Refuse" to Gepetto at the very end while also following the guide (except you are only getting the "Rise of P" ending).
In the second run you would want to follow the same procedure as explained in the guide (truth-run, get the remaining achievements, choose "Refuse" at the end and also not giving Sophia Peace).
And the 3rd Playthrough is where you actually give Gepetto your heart in order to get the 3rd ending "Real Boy" and also to avoid fighting the Nameless Puppet at NG++.

If you follow these rules you will be fine:

• Always lie! For the ending and for a special Weapon we always (mostly) want to lie! If you messed up and told the truth once, I think (not sure) you will still be fine, but keep lieing for the most part. On my first playthrough I didnt lie in these situations: Told Alidoro the truth about Hotel Krat; Told Simon he was creating Monsters; Told Simon what I did to Sophia;
  
• Try to search every nook and cranny for Items and collectibles. The good thing here is that the game is very linear with simple or small sideways. I managed to find most to all items just on my first playthrough. The game also tells you in your Stargaze if you have additional Sidequests or if there is somehting important to get on different Locaitons like records and/or events.
  
• Whenever you find a Stargaze, try to check the Teleporting section if there is something happening with the other locations. Do the NPC's want to talk in the Hotel? Is there a sidequest somewhere or an event? Everytime you defeat a boss, try to talk to everyone in the hotel, and get every possible dialogue option just to be on the safe side.
  
• Whenever defeating one of the main bosses, you receive the bosses Ergos. Its a unique Item that can be traded later on in the game with Alidoro The Hound (The one with the German Shepard mask). You can choose either to get a special weapon or an amulet. If you want to get the "Special Weapon Collector" achievement on your first playthrough, you might want to save the Ergos and trade them only for weapns. But since you can get them in your second playthrough as well, it is not a must. Just a recommendation.
  Important and also Spoilers regarding Alidor: If you chose to kill him he will be replaced by Hugo the Explorer if you have talked to him near the Barren Swamp Bridge Stargazer.

Another thing to note is that you should get 2 endings in your first run, by simply backing your save before the decision and just reload it. It's also important to note that you dont want to start a NG+ run right after the credits, cause there are still some stuff left in the hotel, after the credits were shown.

Ideally you will have 3 achievements left which are "The Story of a Stranger Girl", "Golden Melody", "Free from the puppet string". That means that you can basically ignore most of the game. The only thing to note is that you are honest throughout the whole game. Dont tell any lies (Except for the "Im not a robot" captcha at the hotel door).

Important thing to note: This game is heavy on NG+.

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Deliver a successful Fatal Attack
Attack an enemy from behind or attack the enemy when he is staggered. You will see 3 red clawmarks, press attack and you will perform a fatal blow. You will get this very early on in the game by attacking an enemy from behind.


Repair a Stargazer
Interact with any Stargazer (Lies of P Bonfires). You will get this very early on in the game.


Tell a lie in front of Hotel Krat Entrance
Infront of the Hoteldoor, you will have to lie no matter what playthrough you are on. It will have no influence on the endings.


Try to assemble a weapon
Once you are in the Hotel: Go to Eugénie and talk to her. She will be able to upgrade and assemble weapons for you. Simply connect a blade with a handle and you get the achievement.


Destroy an enemy’s weapon with a perfect guard
In order to destroy the enemy's weapon, you will have to parry the attack, by blocking at the perfect timing. You can do this with every enemy. The amount of parries you will need to destroy the weapon varies from enemy to enemy. The easiest are the puppets with the big sword. You'll get this eventually.


Harvest Gold Coin Fruit
After defeating the Eldest of the Black Rabbit, head to the rabbit hide out and activate the elevator. This will get you back to the hotel. A little further there will be Giango waiting for you and through the left door the gold coin tree will be ready for you to harvest. You need a few gold coins for other achievements, so make sure to harvest.
Note: You can meet Giango in the St. Frangelico Cathedral. Its not a must though. He will come to the hotel regardless. He is a merchant who sells Star Fragments (allows you to call Specter; an AI helper for bossbattles) and wishstones which strenghtens the Specter.


Kill all types of Dimensional Butterflies
In certain areas butterflies will spawn in different colors: Blue, Red, Purple, Gold. Killing one will give you an item. For this achievement you have to kill one of every color. You will meet multiple throughout the game.
Make sure to turn on Geminies lantern all the time. It makes it easier to see if a butterfly will spawn. The surrounding will turn red and a bell will ring. I found a red, purple and a golden one in the barren swamp, where the canon on a tower keeps shooting at you and 2 big Puppet of the Future wander around. Dont worry if you fail to kill a butterfly. Just interact with a Stargazer to make them respawn or try to find them somewhere else. In the last Chapter/Area there will be even more.


Collect all Legion Arms
After defeating the King’s Flame and rescuing Venigni, he will give you the ability to change your Legion Arrm. They should all be available at the start but you still need to unlock them. For this you will need Legion Plugs which are obtainable items in the game. Legion Arms do carry over to the NG+, so dont worry if you dont get them all in the first run.

Modify a Legion Arm to its max level
You can upgrade your Legion Arm with a machine next to Venigni. In order to upgrade your arm, you will need Legion Calibers, and in order to get it to max, you'll need at least 6.


Strengthen a normal weapon to its max level
Normal weapons are the ones you can assemble. You can upgrade those by talking to Eugénie. You need Ergo and Materials for this.


Strengthen a special weapon to its max level
Special weapons are the ones you trade for Boss Ergos (+ Golden Lie). They can also be upgraded by Eugénie, but they need different materials.


Activate P-Organ to Phase 5
After saving Gepetto, his office on the second floor of the Hotel will be available. Next to Gepetto's desk is a gold shimmering Chair. Interact with it and you can Upgrade your P-Organ with Quartz. Quartz can be obtained by boss / elitefights and also in the chests throughout the game. Also the broken puppet next to the Stargazer at Barren Swamps gives you Quartz as a reward for finishing his side quest.

You start with Phase 1 and once you have activated a certain amount of slots ( I think 2), the next phase will be available. Your Phases will carry over to the NG+, so you'll get the Phase-5 eventually.

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Kill the Parade Master

Kill a Stalker / Mad Donkey

Kill the Scrapped Watchman

Kill King’s Flame, Fuoco

Kill the Fallen Archbishop Andreus

Kill the Eldest of the Black Rabbit Brotherhood

Kill Romeo, King of Puppets

Kill Champion Victor

Kill the Puppet-Devouring Green Monster

Kill the Corrupted Parade Master

Kill the Black Rabbit Brotherhood

Kill Laxasia the Complete


Kill the Awakened God Simon Manus

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Collect all normal weapons

There are 29 normal weapons in the game. Most of them are not missable except for 3. The starting weapons can only be bought from the wandering merchant in Cerasani Alley, right before the bossfight with the Parade Master. He wont be available much later in the game, make sure to buy those in order to be on the safe side. If you fail to buy those, don't worry, as your weapons will carry over and you can just buy it on your NG+ run from the very same wandering merchant.

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Collect all special weapons

First of all, you need to find Alidoro the Hound. He is in St. Frangelico Cathedral Library. There is an elevator a little bit further the path opposite of a golden globus - the elevator will bring you directly to him. After riding the elevator to the top floor, Alidoro will ask for a safe space. Tell him about Hotel Krat. ( I didnt lie on this one and was fine)



If, for some reason, you did not find him, he will appear on your path a little further, after you have beaten the Boss of the area.

This can be missable in your first playthrough, if you choose not to trade any Boss Ergos for weapons. Also, the Golden Lie Special Weapon can only be obtained after:

• Getting the Portrait of P / Portrait of a Boy: Its located in the Black Rabbit Brotherhood hideout. Talk to Gepetto to place the portrait on the wall. Depending on how many lies you have told, you'll notice that your nose grows out of the portrait.
  
• Telling enough lies: You dont have to lie every single time, though there must be a certain number of lies told to unlock this weapon.
  
• Since at the current time there are not enough information to confirm this I will just write what I did:
  
  • I lied everytime except for: Telling Alidoro about Hotel Krat; Chose "Monster" in the Gallery talking to SImon; After defeating Simon I told him that I gave Sophia Peace.
    
  • I did give Sophia Peace
    
  • I listened to at least 5 or 6 records at different times.
    
  • I finished all side quests and favors.
    
  • I did get the "Your heart is beating"
    
  • Picked it up BEFORE talking to Gepetto at the very end
    
  • And, just for testing purposes, I also was able to pick it after the credits, before starting a NG*

Additionally for the "Veteran Explorer" achievement you will need the Frozen Feast Special weapon.

Important. ALSO SPOILER: In the Barren Swamps Bridge, before the Boss battle with the Puppet-Devouring Green Monster, you can meet up with Hugo the Explorer infront of a closed gate at the right side of the bridge. Talk to him and try to get every single dialogue option as usual.

A while later after defeating the rest of the Rabbit Brotherhood beneath the Hotel, you will meet Alidoro again. The usual thing: Get every possible Dialogue option and then choose to kill him. You will get a cyper which will be important for another achievement. The important thing is that Hugo will replace Alidoro as the Special Weapons merchant after killing Alidoro. Hugo will move into the hotel and be at the very same spot Alidoro was before.

Special Weapons (11 in total):

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Learn all Gestures

There are 17 in total:

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Decipher all cryptic vessels and claim the rewards

There are 6 in total. The two missables are

• "Alidoro’s Cryptic Vessel" the one with Alidoro, if you choose not to kill him.
  
• The "Mechanical Cryptic Vessel" if you choose not to buy the Frozen Feast special weapon.

In order to read them, you have to bring the Cyphers to Venigni. You can check out the Picture attached to the cypher in your invetory.

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Discover all Trinity Sanctums

Important: This achievement goes together with the "The Story of the Prince" achievement.

The Riddler will call you through telephone cells over the course of the game. Pick up the call and answer the riddles correctly. After every correct answer, you receive a key, which opens the trinity doors. After answering the fifth question, you will be rewarded with a speial key. The Chosen One’s Trinity Key. The key will open the final trinity door in the Arche Abbey Outer Wall, where you will meet Arlecchino and obtain the achievement. You will need to get every door and every riddle for the achievement to unlock.

Phone locations and riddles:

1. Starting early on in the game from the Krat City Hall Courtyard Stargazer you will push through the game until you are close to the workshop and right before a bridge with a bunch of bomb throwing puppets. Instead of crossing the bridge, go right and get the first call. The answer: Human
   
   
   
   
   
   
2. Malum District: This one is not really missable, since you have to past this point in order to proceed. In the district is an open field and enemies are throwing decay bombs from rooftops. Go through the field, take a left turn (dont take the metal ladder), go up the wooden ladder inside a house through the alley and find the phone above. The Answer: Candle
   
   
   
   
   
3. Grand Exhibition Gallery: Cant really miss that. After meeting Belle (the blond-haired women - the ladder outside of the gallery and under the electrobomb-throwing robots on steel beams) and fighting several saw-blade roboter, you'll see and hear the phone ringing. The Answer: Egg
   
   
   
   
   
4. Krat Central Station Street: The phone should be where the riverstreet is. From the Stargazer go down the stairs and a little bit further when you see the river, go left. The Answer: Ergo
   
   
   
   
   
   
5. The last one is in the Sealed Underground beneath the Hotel Krat. After battling the first Elite Enemy you will find yourself in a split path.Answer Yes

As a reward you will get The Chosen One’s Trinity Key which will open the last door in the Arche Abbey Outer Wall.


Trinity Door locations:

1. The first one is in the Workshop Union Culvert. The very first time you meet the Red Fox and the Black Cat, instead of following the bossroute up the stairs to your right, go inside the red pipe. Follow the pipe to the end and go right into the room where 3 enemies are waiting. Kill those and walk through the stone passage as shown in the picture. Follow the path to find the first Trinity Door.
   
   
   
   
   
2. The next one is in the St Frangelico Cathedral Chapel. After some annoying climbing you will find yourself trying to avoid a giant electric ball. Next to the Ball falling down is a ladder. Climb the ladder up and keep follwing the path for the next Trinity Door.
   
   
   
   
   
3. This one is easy to miss but also easy to find. Before going to the Bossarea, you will see a giant lighted chandelier swinging above a hole. Drop down the hole to find the next Trinity Door.
   
   
   
   
   
4. The forth one is in the altered version of the Krat Central Station Lobby Stargazer. Very hard to miss.
   
   
   
   
   
5. The final trinity door is at the very bottom of a tower in Arche Abbey Outer Wall. From the Stargazer, once you have dropped down inside a vertical tower, you will encounter an eliteenemy jumping at you and where you will have to ride an elevator to the top to proceed to next area. Instead open the last trinity door and meet Arlecchino.
   
   
   
   He will ask you a final question. I answered Human. After that, get every possible dialogue option out of him. if you did not get the "Moon World Warrior Toy", get to Wandering Merchant at Lorenzini Arcade close to the big fountain and the bathroom. Near him is the book “Scandal! V, the Tragedy Behind the Flamboyance”. Read that and try talking to Arlecchino again. Also, you might want to talk to Venigni as well, since its part of his story.

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Collect and play all records

This is only part 1. Part 2 with the remaining records are further down. The reason is that 6 records are only available in NG+.

Thanks @Kalhoun for the information: You dont need to have every record on one single file. As long as you have listened to every record (even through multiple saves), the achievement should unlock.

1. Feel
   From the "Inside the House on Elysion Boulevard" Stargazer a bit further on is a large area with 2 ladders going down and a Police Officer Puppet marching around. Before going down, head to the window, where the lights are on and a silhouette of a woman is shown. Talk to her and accept the Sidequest.
   
   
   
   Proceed with your journey, past the bridge with the hanging robot, past the next stargazer and the swordmen puppets and find yourself in a garden before the next boss fight area where a big eliteenemy is punching on a buch of dead bodies. You will find Broken Baby Puppet there. The Item will only appear if you have talked to the women first. Return the baby to the Women and choose the lieing option "It's a cute baby". She will reward you with the record.
   
   
   
   
   
2. Divine Service
   You will get this one from Sister Cecile in the St. Frangelico Cathedral Library very close to the Stargazer. FInd her and talk to her to accept her request.
   
   
   
   After collecting the Archbishop's Holy Mark in the Archbishop's office, head back to Cecile and talk to her again before fighting the boss.
   
   
   
   Now keep playing until you have defeated the boss of the Area (Fallen Archbishop Andreus). Return to Cecile to pick up and read the letter that she left on the floor.
   
   
   
3. Someday
   Purchasable from the Wandering Merchant in the Red Lobsters Inn in Malum District. When inside, dont go upstairs, instead try to find a ladder hidden behind shelfs. Get up, find the merchant and gift him any Ergo fragment. After that you are able to see his wares and also the "Someday"-Record for 3,800 Ergos.
   
   
   
   
   
4. Fascination
   Before entering the big white Opera House right infront of the "Estella Opera House Entrance" Stargazer, make sure to buy a Red Apple from Polendina in Hotel Krat. You will need this for Adelina in the Opera House.
   Find Adelina upstairs - take the stais to your right and after that go up the stairs with the bloodstains. Past the Spiderlady and turn left on the balcony to find Adelina. Talk to her and give her the apple.
   
   
   
   
   Defeat the Boss in this area and return to Adelina. She will leave the record on the floor.
   
   
   
5. Quixotic
   After defeating Champion Victor in the Grand Exhibition Conference Room, proceed a little further until you meet the Red Fox and the Black Cat. Give them some Gold coins and you will receive the record.
   
   
   
6. Why
   For this record, you need to have met and talked to Belle in the Grand Exhibition Gallery. After defeating Champion Victor she will move in the hotel. Belle is on the 3rd floor after taking the ladder outside of the gallery where a purple butterfly spawn. Go up the roof and drop down the steel beams, on which electrothrowing-puppets and that shieldenemy are. It is very important that you talk to Belle the moment you see her and not after the fight with the boss, as she will die if you don't.
   
   
   
   Proceed with the story to the point where Belle will tell you about a lost friend (I think after the Barren Swamp Chapter). Accept her quest and make your way to the "altered" Krat Central Station which is on your storypath anyways. Find him in a train under a stairway and talk to him. He will give you an Item which you will have to return to Belle. Lie to her and tell her that he died fighting. She will give you the record.
   
   
   
   
   
7. Misty E’rA
   This record is in the Hermit's Cave. Its part of the "Veteran Explorer" achievement, where you have to find and decipher the Rusty Cryptic Vessel. The Hermit's Cave itself is close to the Barren Swamp Bridge Stargazer, right behind the gate where you first met Hugo the explorer. Make your way through the cave till the very end and kill the Eliteenemy to obtain the record.
   
   
   
   
   
8. Far East Princess
   After defeating the remaining Rabbit Brotherhood Relic on the Trismegistus Combat Field and also killing Alidoro, you will receive Alidoro's cypher. Return to the Hotel, let Venigni decypher it and read at once. Now talk to Eugénie and choose to lie: “I think he was just a talented Stalker”.
   
   
   
9. Memory of Beach
   In order to get this you will need to first get a cure for Antonia and give it to Polendina while also telling him to cure her. This is also part of the "The Story of the Refined Old Lady" achievement.
   
   After defeating Laxasia The Complete, head back to the hotel and talk to Polendina. He will tell you that Antonia has passed away. Go upstairs to Gepetto's Office and find the record on Antonia's chair.
   
   
   
10. Shadow Flower
    After you have defeated Laxasia The Complete you will meet Sophia on a chair. Choose "Give her Peace" and find the record on the same chair after she vanished.
    
    
    Please note that there are still 6 left. The rest is only available in NG+. Further down in the "Playthrough 2" section is small guide on how to get the remaining records.

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Find out about the last story of Antonia

This achievement starts with the receptionist of the Hotel, Polendina, telling you about the condition of Antonia. This happens after you have unlocked the Gold Coin Tree. Make sure to always check the Stargazer in case Polendina wants to talk to you and also try to get every dialogue option. Once that happened:

• Go to Giangio close to the golden tree coin and ask for the cure for Antonia.
  
• Head back to Polendina and tell him to cure Antonio.
  
• After that, talk to Antonia.
  
• Note:
  There is a missable Gesture "Greet" during this achievement. The conditions for the Greet Gesture: Get the cure, Tell Polendina to cure Antonio, Kill the Green Swamp Boss and then talk to Antonia to get the gesture.
  
• Now keep playing the game normally until you have defeated Laxasia The Complete.
  
• Head back to the Hotel and talk to Polendina. Get every possible dialogue option and then go upstaris to Gepetto's office where Antionia was. You will see an empty chair and some items on it. Get those (and read it in case) and you should have the achievement.

Find out about the last story of Venigni

Follow the "End of Riddles" achievement and make sure that you have the "Moon World Warrior Toy". Go back to the hotel and speak to Venigni to get the achievement.


Find out about the last story of Simon Manus

After defeating and talking to Simon. You will get this achievemnt regardless of you answer.



Find out about the last story of Geppetto

You will get this AFTER you have seen the "Good boy" ending, BUT have not started a NG+. Once you have seen the credits, cancel the NG+ window and the game will teleport you the hotel. Go upstairs to Gepetto's office and get the items on his desks. Read it and you should get the achievement.

So:

• Defeat Simon
  
• Go down the elevator to get to Gepetto
  
• Give Gepetto your heart
  
• See the ending and the credits
  
• Dont start a NG+
  
• Head upstairs to his office, get the note and read it

Find out about the last story of Sophia

You will get this AFTER you have seen the "Rise of P" ending in your LIE-walkthrough of the game, BUT have not started a NG+ run right after the credits.
Its also important to note that you have chosen the "Give Sophia Peace" option after defeating Laxasia the Complete.

So:

• Defeat Laxasia the Complete
  
• Choose "Give Sophia Peace"
  
• Defeat Simon
  
• Go down the elevator to get to Gepetto
  
• "Refuse" on the request to give the heart
  
• Fight fight fight
  
• Cutscene, Credits
  
• Dont start NG+, get back to the Hotel, upstairs to Gepetto's office and read the note. Done

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This part becomes relevant once you have defeated Laxasia the Complete. Before battling her, make sure you've done everything else. Also talk to every NPC just in case.

1. Defeat Laxasia the Complete
   
2. Talk to Sophia and choose "Give her Peace"
   
3. Proceed until you fight Simon, and defeat him
   
4. You can lie to him just to be sure, but I have told him the truth
   
5. Go down the elevator and activate the Stargazer
   
6. Now close the game, back up your save in Steam\steamapps\common\Lies of P\LiesofP\Saved. Make sure that you also have turned off the Steamcloud. Go to your Steamlibrary, right-click on "Lies of P" and click "Settings". Now look for "Steamcloud" and turn it off
   
7. Enter the game, load and go to Gepetto
   
8. Choose to give him your Heart and watch the ending and the credits
   
9. When asked for NG+, choose CANCEL
   
10. You will be ported back to the hotel, where weird stuff happened. Whatever, go upstairs and read the note on Gepetto's desk and unlock "The Story of One Father" achievement
    
11. Go downstaris again and play the piano to unlock the "Pianist of Krat" achievement

Now overwrite your save with your backup save to get to the initial savepoint

1. Go to Gepetto and this time choose "Refuse"
   
2. Fight against IMO the hardest MF in the game and once defeated you will receive the "The First Puppet" achievement
   
3. Watch the cutscene and credits; You will know you have succeeded when: Gepetto dies in your arms while you drop a tear and he says: "Sorry... son"
   
4. When asked for NG+, choose CANCEL
   
5. You will be back at the Hotel
   
6. Go upstairs to the office, read the letter at the desk to unlock "The Story of the Blue Butterfly", pick up the Golden Lie weapon hanging at the portrait
   
7. Go back downstairs to Hugo and buy the remaining Special weapons. If you want, you can also upgrade them now, since they do carry over to the next game.

Once you are ready (and ideally only have 3 Achievements left), you can start a NG+ from the Hotel Stargazer.

Achievements that you should have unlocked after following the guide:


[Real boy: They all lived happily ever after] Reach the ending
Only available after giving Gepetto your heart after the battle with Simon.



Find out about the last story of Geppetto
After seeing the the "Real Boy" Ending, DO NOT start a NG+. Instead choose cancel and read the note on Gepetto's desk in his Office upstairs in the Hotel.


Play a perfect tune on the piano at Hotel Krat
After finishing the game: Cancel the NG+ request and go to the piano in the Hotel. Interact with it and choose "Start performance". This can only be done once you have finished the game and not yet started a NG+.



Kill the Nameless Puppet
This fight is only available after you have refused to give Gepetto your heart at the very end of the game.


[Rise of P] Reach the ending
This is the ending for you LIE-walkthtough. Also important to note that you have to become more "human", with listening to Records, lieing, doing sidequests and giving Sophia peace. You can also use the "Pray" gesture infront of the angel statue with one wing. Teleport to the St. Frangelico Cathedral Chapel stargazer, turn around, go across the bridge and open the door to the statue.
Once "Your heart starts beating" you are on the right track.



Find out about the last story of Sophia
First you have to give Sophia Peace after the battle with Laxasia the Complete. Then, after seeing the "Rise of P" ending and the credits, DO NOT start a NG+, instead go upstairs to Gepetto's office and read the letter on the desk.



Collect all special weapons
Explained at bit further up in the guide.

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The only thing to remember here is:

• Make sure to always tell the truth.
  
• Make sure to buy the records, especially the first one from the Wandering Merchant in Cerasani Alley, since he will not be available later in the game. [More on my guide]
  
• Make sure to do the Eugénie side quest and tell her the truth as well by killing Alidoro, deciphing the crypt and reading it before talking to her.
  
• Find and talk to Subject 826 in the Arche Abbey Outer Wall and also open the stone gate. Find him, after defeating Laxasia The Complete, on the bridge above the Rosa Isabelle Street. [More on my guide]
  
• Dont give Sophia Peace after defeating Laxasia The Complete and entering her room.
  
• Refuse to give Gepetto your heart.

Find out about the last story of Eugénie

This one is quite straight foward. After Alidoro has entered the hotel, and after you have defeated Victor the Champ, Eugénie will ask you to give Alidoro a four-fingered glove. At the same time, Alidoro has wandered to the Barren Swamp, the area you are headed next.
Once you have met him on your way (he is basically unmissable - you will see him) give him the gloves and get every dialogue option out of him. Return to Eugénie and tell her the truth (because this is the truth-walkthrough) and proceed with the game.

After you have defeated the remaining Rabbit Brotherhood (your second encounter, after the Hotel invasion), you will meet Alidoro again. As usual, get every single dialogue option before killing him. He will drop a Crypic Vessel.

Make sure to FIRST ask Venigni to decipher the Vessel and THEN READ IT before talking to Eugénie in order to reveal the truth. Next, talk to Eugénie, choose the "He was Eugénie’s older brother". Re-enter the hotel, by first teleporting somewhere else and then port back to the hotel, to talk to Eugénie again. She will give you a record and the achievement should pop.


[Free from the puppet string] Reach the ending

This is the remaining ending. The only things you have to remember are:

• Dont tell any lies (Except for the Hotel door one)
  
• Dont give Sophia peace
  
• Dont give Gepetto your heart.

After you have battled and defeated the even heavier version of the nameless puppet, you will notice a change in the dialogue. Before that the cutscene is the same as in "Rise of P", so dont freak out like I did. You will notice the difference, once... Gepetto is dying in your arms and says: "I... knew it... You're just a useless... Puppet" The achievement should pop then.


Collect and play all records

This is Part 2, which only contains the remaining 6 records that you can only get in your second playthroug.
Part 1 and the other records that you should get on your first playthrough are further up.

Thanks @Kalhoun for the information: You dont need to have every record on one single file. As long as you have listened to every record (even through multiple saves), the achievement should unlock.

1. Proposal, Flower, Wolf Part 1 (Golden)
   Cerasani Allery Stargazer: Wandering Merchant for 6,000 Ergo
   
   
   
   
2. Quixotic (Golden)
   Inside the House on Elysion Boulevard Stargazer: Wandering Merchant for 10,000
   
   Ergos
   
   
3. Shadow Flower (Golden)
   Lorenzini Arcade: Wandering Merchant for 10,000 Ergo
   
   
   
   
4. Memory of Beach (Golden)
   Abandoned Apartment Stargazer: Wandering Merchant for 10,000 Ergos
   
   
   
   
5. Proposal, Flower, Wolf Part 1
   Reward for finishing "The Story of a Stranger Girl" achievement.
   
   
6. Fascination (Golden)
   You get this one from Subject 826, who is located at the Arche Abbey Outer Wall. A bit further from the Stargaze is a vertical place where you'll have to go down to the bottom of the room. You will see the last trinity door and a muscle-packed dude trying to fight you. From where this monster jumped out is a corridor with 2 traps and a elevator, which will bring you to Subject 826. Talk to him and make sure to open the gate. If you miss opening the door, he will not go anywhere for some reason.
   
   
   
   After defeating Laxasia the Complete, Subject 826 will move to the bridge above Rosa Isabelle Street. To get there the fastest, teleport to Estella Opera House Entrance, go back downstairs where you fought the Clown mini-boss. Go down the path and you will see a bridge, on which Subject 826 should be waiting for you. Talk to him and buy the last record.
   
   

Last thing to do is to play the records. All of them. However, you dont really have to play every single one to the end. Just click through the records, and make sure to wait for the "Save"-Icon at the top-right corner.

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You should now have every achievement. I hope the guide helped. Not everything here is set in stone, though. There are still some things that I'm not 100% sure about. If you have noticed any content errors, feel free to comment. Thanks.