Here is the full list of all 36 Spooky Men achievements.
Be like David
Be like Clara
Become the streamer of this game
Complete tutorial
Reach level 5
Reach level 10
Reach level 15
Reach level 20
Reach level 25
Reach level 30
Reach level 35
Reach level 40
Reach level 45
Reach level 50
Reach level 55
Reach level 60
Reach level 65
Reach level 70
Reach level 75
Reach level 80
Reach level 85
Reach level 90
Reach level 95
Reach level 100