Here is the full list of all 12 Ghost Watchers achievements.
Сatch a Demon
Throw the catcher into the river
Stay in the van for more than 10 minutes
Play a full-party game
Save up 10,000
Catch 5 different ghosts
Catch a Child
Run with a torch in hand for 5 minutes straight
Walk with a сrucifixion in hands for more than 5 minutes
Win without using a flashlight
Press the space bar 20 times
Escape in less than 5 minutes after the start