Full list of all 27 Layers of Fear achievements. It takes around 10-12 hours to unlock all of the achievements in the base game on Windows.
The base game contains 18 achievements, and there is 1 DLC pack containing 9 achievements.
Gazed at paintings for a total of an hour
Gathered all drawings of rodents
Gathered all family mementos
Recalled every word you said
Made up your mind
Completed a painting
Embraced death for the first time
Searched 100 drawers and cabinets
Took a thousand steps
Collected a rat sketch
Discovered an echo from the past
Found a memento of your family
Got working on your Magnum Opus
Assemble all the puzzle pieces.
Read every note in the game.
Recalled all your childhood memories.