Here is the full list of all 23 SO BELOW achievements.
Finish a game while being a ghost
Defeat any entity once
Defeat the undead once
Dying before 10 minutes
Die for the first time
Defeat all 5 Original entities
Defeat la llorona once
Defeat the shadow once
Defeat the Nachgeist once
Defeat the flicker once
Vanquish the 5 original entities 5 times each
Defeat any boss 30 times
Walk more than 100,000 steps during hunts.
No, this is just fantasy!
Finish a game without receiving any damage
Defeat any boss before the 5 minute mark
Finish a game on single player mode
Finish a game with 4 players alive
Finish a game as the last player standing
Fail a game by timeout
Finish the game within the last 5 minutes of the game
Win a game with every player character
Defeat the nun once