Get 100 kills on Xbox Live
Get 50 kills on Xbox Live
Complete Episode 4 on 'Hurt Me Plenty' or higher
Complete all levels on UltraViolent mode
Complete Episode 3 on 'Hurt Me Plenty' or higher
Complete Episode 2 on 'Hurt Me Plenty' or higher
Complete Episode 1 on 'Hurt Me Plenty' or higher
Find all items in level
Win a Nightmare level in single player
Kill all monsters in level on 'Hurt Me Plenty' or higher
Find a secret area of a map
Complete any level