Here is the full list of all 22 Paramnesia: Escape Together achievements.
Am I a giant or a miniature?
Keep running and running.
Five blue butterflies were caught.
Gulliver's Travels?
Get hit frequently.
Always throwing books away.
All accessories unlocked.
Under serious investigation.
Friendship no longer exists.
Fifteen blue butterflies were caught.
Thirty blue butterflies were caught.
The fog in front of my eyes has dissipated.
Back to where I should be.
Unlocked the final space.
Successfully solved the Sudoku puzzle.
Complete the puzzle without any injuries.
Arriving at the basement of the gallery.
Responded very quickly and eliminated the threat.
Is the world upside down?
We finally left here together, right?
Finally achieved immortality.
Start with a gun, end with a gun.