Here is the full list of all 8 Unlasting Horror achievements.
Congrats you've turned on a Light! You must be proud.
Hm.. I can see you're very well known with your weapons.. Well enjoy this achievement.
Congrats you're getting the hang of things you learned to jump!
Attacked!
Unlocked by playing on the forest level.
Play as the survivor at least once.
Play as the monster at least once.
Unlocked by playing on the Neighborhood level.