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