Kill one of every enemy.
Reach the end of 'Legacy of Rust'.
Obliterate 50 enemies with a single shot of the Calamity Blade.
Immolate a total of 30 arachnoid enemies with the Incinerator.
Reach the end of 'Sigil'.
Reach the end of 'No Rest for the Living'.
Reach the end of 'The Plutonia Experiment'.
Reach the end of 'TNT: Evilution'.
Reach the end of 'Master Levels for DOOM II'.
Reach the end of 'DOOM II'.
Reach the end of 'DOOM'.
Complete 8 different levels sequentially under par time without dying on Ultra-Violence or higher.
Kill 4 enemies in 1 shot with the Super Shotgun.
Get 100 Chainsaw kills.
Kill 2 enemies with a single barrel explosion.
Finish a level with 200% armor and 200% health.
Finish off a Cyberdemon with the Pistol.
Get 3 multi-kills with the Shotgun.
Gib three or more enemies with a single rocket explosion.
Kill 5 enemies in 5 seconds with the Plasma Rifle.
Complete a level on Nightmare difficulty.
Find a secret level.
Shoot 200 bullets consecutively with the Chaingun.
Kill only a single enemy with a BFG9000 blast.
Crush a corpse in a door.
Finish a level with 100% items picked up.
Kill all monsters in any monster-filled level on 'Hurt me plenty' or higher.
Complete any monster-filled level with 100% kills, items, and secrets.
Complete any monster-filled level with 100% kills without getting hurt on Ultra-Violence or higher.
Get 25 kills with your Fists in a single level.
Find a secret area.
Get 20 kills using the berserk powerup in a single level.
Cause an enemy to kill another enemy.
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