Getting the achievements in this game is rather easy, as long as you're progressing through the game. Aside from one, all the achievements are unmissable story achievements. Thus, this guide explains when and where in the game these achievements unlock.

This guide does not in any way aim to be a puzzle guide or walkthrough. The game also has an excellent hint system which lets you visually see where to go next if you're stuck on where to go in the game, or lets you get hints for puzzles you're trying to solve. If you can't wrap your head around a puzzle, you play mainly for the story, or just want to get the achievements as quickly as possible, you can choose to have the puzzle solved for you after going through the available hints.

The game took me about 13 hours to complete, playing it normally, and also dealing with a lot of crashes: Make sure to save often!

The achievements are listed below in the order they appear on the achievements list page for the game. This is also most likely the sequence in which you will unlock them. (I believe there might be a couple that could be unlocked out of sequence.)

This achievement unlocks when you get through the tutorial at the very start of the game. You can just skip through the dialogue without any consequence.

This achievement unlocks when you free Zak the talking dog during the early parts of the game. He's locked inside a wooden cupboard found in a room on the ground floor. You can find him by going through to the right of the rightmost set of stairs in the entry hall.

This achievement unlocks when you see Lydia's first vision. This happens early in the game, in the garden area when Lydia finds the doll she gave Celeste.

This achievement unlocks when you see Lydia's second vision. This happens early in the game, after activating the machinery and pulling the lever to open the gate in the entry hall.

This achievement unlocks when you see Lydia's third vision. This happens early in the game, after going through the cellar and going out into the woods.

This achievement unlocks when you see Lydia's fourth vision. This happens early in the game, after giving Zak a potion that makes him pass out.

This achievement unlocks when you turn Zak into a small cat. This happens while being in the lower levels of the Academy, the first time you brew a potion.

This achievement unlocks when you finish the three trials to officially become a student of the Academy. This happens just before getting to the upper part of the Academy, and requires having found your staff so you can open the three stone doors.

The first stone door/trial is at the top of the central staircase(behind the gate in the entry hall), and immediately to the right. Can be hard to spot.

The second stone door/trial is high up outside, between the two study halls bearing large plaques inlaid into the floor that speak of the history of the Academy. It's the long, balcony like area where Zak will cower on one end until you reach the other, and will the come running after you. Enter the door, then cross the bridge/walkway and you'll find the door.

The third stone door/trial is found by moving to the right from the first stone door, and climbing the stairs almost all the way to the top where the three golems/guardians/minotaur looking, speaking statues are.

This achievement unlocks when you see Lydia's fifth vision. This happens later in the game, shortly after getting to the upper levels, when you find and enter Celeste's room.

This achievement unlocks when you turn Zak into a small dragon. This happens after getting to the upper levels of the Academy, and after reaching the Oracle.

This achievement unlocks when you see Lydia's sixth vision. This happens near the end of the game, after solving all the classroom puzzles and getting all four of the teachers' secret key items.

This achievement unlocks when you turn Zak back into a human. This happens after getting to the upper levels of the Academy, and very close to the end of the game.

This achievement unlocks after finishing the final puzzle in the Sanctuary, and watching the seventh and final vision/memory of Celeste.

This achievement unlocks at the end of the credits after completing the game. Just let the credits roll through, and that's it.

NOTE: Some people experience crashing during the credits. If this happens to you, go to your Steam Library, right click on Keepsake, and choose Properties. In the properties window, go to Languages and choose Francais (French), and close the window. Once the new files have been downloaded, run the game in WINDOWED mode(not fullscreen). Play through the ending again, and now it shouldn't crash during the credits, letting you get that final achievement!

Those are all the achievements. It's basically just the final one that you might miss, and only if you skip the credits somehow. (See the note about the game crashing under that achievement.)

The game has quite a few bugs that can cause crashes, so saving often is a good idea. Luckily it doesn't take long to restart and reload the game.

Even if most of the achievements are unmissable, some achievement hunters might want to know this before starting a game. And for people having trouble getting that last achievement, there's now a guide that explains a way to fix this. So this guide is mainly for these people.

I hope you enjoyed this guide!