This guide is mostly about the relics and their locations, as those probably are the biggest problem achievement-wise in the game. Reason for that are mostly the weird autosaves in the chapter levels (Windmills City, Woodborn, The Vineyard), when once you step through the wrong door, it closes behind you and you have no chance to get back to anything you might have missed. And as the game sadly has no option for a level replay you would have to start a new game to get those. But also the relics in the open world part (the Red Plains of Oblena serve as a kind of hub to which you return after each chapter level) are sometimes hard to find, at least I searched for nearly an hour without finding the last one. Last but not least, it’s important to note that you probably need to finish all achievement requirements in one playthrough to get the overall achievement for getting all of them.

Anyway, like with all games who don't feature level replays or have missable achievements, I'd advise to regularly back up your save file, so if something goes wrong, you at least don't have to replay the whole game. The save file is located at User – your name - Appdata – Local – Effie. If you can’t find it, remember that the AppData folder is normally hidden and must be made visible in the folder options in the system settings by ticking the appropriate box to show those folders. Also best turn off Steam cloud while messing around with save files.

For completion's sake I also included the other achievements in this guide as well, but most of them are nearly impossible to miss I'd say. So here goes.

These achievements are part of the story and therefore unmissable.

More than a companion
Get Runestone.


A small victory
Defeat Melira at the Temple of the Elder Protectors.


Beware, I can ram you!
Get the Dash skill.


Protector of cities
Defeat Melira at Windmills Town.


Round... and round... and round I go!
Get the Boomerang skill.


Songs will be sung
Defeat Melira at Woodborn.


Was that an earthquake?
Get the Earthquake skill.


The best companion ever
Get all Runestone skills.


A sweet victory
Defeat Melira at The Vineyards.


The end of an adventure
Defeat Melira at the Temple of Oblena.

Most of them are very easy, only one requires a bit more work.

Vigorous
Upgrade Galand's power for the first time.


Actually kind of unmissable. Collect enough runes and open blue chests to increase your power. I was even already able to upgrade the first time during the temple.


Galand "the Powerful"
Upgrade Galand’s power 6 times.


I didn't count during my playthrough, but I got this achievement during the Woodborn area. Just try to collect as many runes and experience chests as you can, look behind buildings and for more hidden areas etc. I can't say how much you really need, but there's definitely quite a lot of room for missing stuff, because in the end I upgraded 8 or 9 times altogether I think.


Experienced
Open 20 Experience Chests.


Should be easy. There are so many chests around, I actually got this pretty early in the game.


Speed lover
Reach the maximum speed surfing.


Just surf through several of those yellow light circles in quick succession. Isn't really difficult, I got this achievement a few minutes into the plains automatically when I surfed through the river.


Effie, a fantasy adventure
Get all the trophies of Effie.


Should trigger when you beat Melira in the final boss fight. I've read that people had problems triggering this during the game when they tried to get missing achievements in a second playthrough. So due to those user experiences everything at the moment indicates that you most likely need to finish all achievement requirements in one playthrough and finish the game for this one to pop (see linked threads for sources).
https://gtm.steamproxy.vip/app/975950/discussions/0/3035978213217657992/
https://gtm.steamproxy.vip/app/975950/discussions/0/2245553353032357770/
(credits also go to AlekseOnYoutube who confirms this in his guide)

------------


Unmissable. You have to open this chest to proceed at some point.


Tomb raider
Find all relics in the Temple of the Elder Protectors.





Please note that as the plains serve as some kind of hub for the different chapter levels, you’ll always return there after finishing one of them. Which means you can take your time, up to the point at the end of the game before entering the Temple of Oblena for the final boss fight. Anyway, this area is pretty huge and features the massive count of 11 relics, so it's somehow easy to just miss one location. I'm trying to describe the locations as good as I can, and I hope the screenshots do the rest to half-way be able to pinpoint their approximate place. What's interesting, there's even a stylized map to the east shortly after entering the plains from the temple, but to be honest, I didn't recognise this until the end of the game.


_____

Relic 1: Fisher Fish
To the left after entering the Red Plains from the Protector Temple there's a large wooden tower sitting on a small lake. The chest is on top of it.


A walk to remember
Complete the Fisher Fish area.


_____

Relic 2: Ghoul Encampment
Straight from the Temple of the Elder Prospectors in direction to Windmills City, about half-way, there's a small forest with an encampment in it. The chest is on top of that.


_____

Relic 3: Ghoul Encampment
Before Windmills City a bit to the left there's another small wooden structure with a relic chest on top.


_____

Relic 4: Fire Hammer Coliseum
Around height of Windmills City far to the west. You have to win several rounds of fights there for the chest to spawn as a reward. I'd advise to do this later in the game when you have powered up more and have gained the special moves from the 3 main levels.


Maximus "the Gladiator"
Complete the Fire Hammer Coliseum area.


_____

Relic 5: Harmony Obelisks
Before Windmills City a bit to the east is a large white structure with platforms circling around it. The chest is at the top of the long climb.


The Three Towers
Complete the Harmony Obelisks area.


_____

Relic 6: The Quick Imp
On height of Windmills City to the east, just north of the Harmony Obelisks, there is a small fort with a racing banner. Win the rather easy race and the fort will open. Inside on the first floor there's the golden chest.


2 Fast 2 Furious
Complete the Quick Imp area.


_____

Relic 7: Between Windmill City and The Vineyard (a bit left of the large barrels) there's a small forest, inside is a very small tree cove with the chest inside.


_____

Relic 8: Quiet Rock
Also between the windmills and the barrels, just left of relic 7, is a graveyard-like structure. Inside you'll find 4 levers, pull the correct one (in the back to the right seen from main gate, with the statue of a winged angel holding a sword), and the gate to the chest will open. Pulling any other lever will just spawn a few ghosts. (Thanks @Glinomes, see Comments below).


]Ghostbusters
Complete the Quiet Rock area.


_____

Relic 9: In height of Woodborn to the west, just north of the coliseum, there's a kind of tiny fishing village in the river. The chest is right there on the little dock.


_____

Relic 10: Behind the Vineyard, a little bit right of the Temple of Oblena, there's a chest sitting in a small burnt-down hut.


_____

Relic 11: Right in front of the Temple of Oblena, there's a kind of swamp with a relic right in the middle of it, guarded by several heavy enemies.


_____

Private eye Galand
Find all relics in the Red Plains of Oblena.





Relic 1: After getting the Dash, continue until the end of the next area and don't go up the wall yet. There's this door with a large skull, go left to the trees, and behind the tight corner there's the chest.


______

Relic 2: Right at the end of the level you'll get to some kind of sewers. Don't go the straight way to the exit (or you will be shut out from the relic), but go through this side opening to the left. You'll arrive in a cellar, but you first have to go up through the banquet hall to get to the other side of the bars. The chest is hidden behind some boxes there.


The Librarian
Find all relics in Windmills Town.





Relic 1: Right after entering Woodborn, just at the first junction turn right. You'll see a small passage (marked in the screenshot). Through there is the chest.


______

Relic 2: Right before the end, at the place with the large dragon skeleton statue, go to the right. The chest is left beside the last hut.


The Searcher
Find all relics in Woodborn.





Relic 1: Early in the small market area. In the wing to the right there's a lever hidden behind the last barrel to the left. Pulling it will open up a door in the left wing hidden behind boxes. In this room you'll find the chest.


_____

Relic 2: After the long barrel ride nearly at the end, there's a small turning puzzle. Turn the middle element so that you can go straight through (e.g. like in the screenshot, where the boxes are). Behind it is another room with a closed door. Pull the trigger, and outside is the chest.


Taster of stories
Find all relics in The Vineyards.


_____

Collector
Find all relics.

I'm calling this one a secret or easteregg, because it's definitely hidden very, very well. Left of Woodborn, a bit north of relic 8 (the fishing village), there are 2 large white stones lying around. You can climb on one of them, and inside there's a small lever. If you pull it, it opens up a strange trapdoor to the west of the stones, revealing a kind of tomb. It got some runes, but what the other purpose or meaning is, I just can guess.


_____

I included this for people that might be interested in the lore but missed or don't care for the achievements or finding those relics themselves. This stuff is normally tedious to find on the internet, so here goes, again for the sake of completion. Just scroll down if it's too boring ;)

Hope this guide helps a few people to have more fun in the game. I had to write some stuff out of memory, so there might also be some minor mistakes in it, can't rule that out. And I apologize upfront for any unclear explanation and screenshot, sometimes it's difficult to describe something the easy way.

Anyway, thanks for your time, cheers!