Here is the full list of all 14 Gravewood High achievements.
Crawl out of the well and observe the school
Disconnect the wire at the school sign
Find the room with the antique portrait
Pick up the thing you’ve been specifically asked not to
Catch that damn laughing map fragment
Get out of the nasty basement
Assemble the world map
Find the Halloween room
Assemble the missing human parts
The floor is a staircase? Wut?
Survive the loop
Complete Level 1
You made a discovery where one seemed impossible