Here is the full list of all 11 Light Borrower achievements.
Completed the first room.
Reached the final room.
Found a locked door in the entryway.
Opened a window in the classroom.
Uncovered a secret near a coffin.
Vandalized a work of art in the hydroponic farm.
Completed the Cleansing.
Felt sun on your skin for the first time.
Chose to stay.
Discovered all readings.
Sought revelation in a promotional trailer.