Here is the full list of all 21 Occult achievements.
defeat the evil
collected 10 jewelry
start a four-player game
kill mediums
throw a friend out of the cupboard 5 times
killed the Spiderlady
25 window jumps
first time stunned by a monster
helped a friend get up
sat in the closet for more than a minute
open lockers and drawers 50 times
found the phone and answered the call
start a game together
caught 25 spiders
mirror quest finished
died from the fall
complete the game alone
5 minutes to stand by the car
open 3 locked doors
big bang
kill with train