100 headshots
Slay 25 demons with melee weapons
Slay 25 cultists with the scythe
Complete FPS God difficulty
Find all secrets
Destroy the Demon's Flower
Slay the UFO Demon
Survive 10 waves in Endless Mayhem
Survive 20 waves in Endless Mayhem
Survive 30 waves in Endless Mayhem
Survive 40 waves in Endless Mayhem
Survive 50 waves in Endless Mayhem
Survive 60 waves in Endless Mayhem
Survive 70 waves in Endless Mayhem
Survive 80 waves in Endless Mayhem