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.
Solved all pages of the Great Book.
You have learned the ways of the SNéK.
Why did you do that?
Find all audio recordings.
Ahh! Scary noise! No!
Solve the wire puzzle.
Healed and ready to execute some puzzles.
Score 600 or higher in a certain challenge.