Here is the full list of all 10 The Looker achievements. It takes around 1-2 hours to unlock all of the achievements on Windows.
Solve a puzzle in real life.
Complete the environmental puzzle.
You have learned the ways of the SNéK.
Solved all pages of the Great Book.
Why did you do that?
Ahh! Scary noise! No!
Solve the wire puzzle.
Healed and ready to execute some puzzles.
Score 600 or higher in a certain challenge.
Find all audio recordings.