Here is the full list of all 16 Falta achievements.
Finish the Game
Finish Randomized mode
Finish Nightmare mode
Finish Blind Man's Bluff mode
Finish all game modes!
Finish the game in under 20 minutes
Finish the game in under 15 minutes
Get all the items in the game!
Finish the game without using the cameras once
Watch the final cutscene
Collect all the memories
The monster chased you for 30 seconds
Escape the monster 5 times
Get all the achievements in the game!
Use all the toilets in the school
Use the canteen alarm more times than you have to