Kill one of every enemy.
Complete 8 different levels sequentially under par time without dying on Ultra-Violence or higher.
Find a secret level.
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 'Legacy of Rust'.
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'.
Finish off a Cyberdemon with the Pistol.
Reach the end of 'Master Levels for DOOM II'.
Reach the end of 'DOOM II'.
Get 100 Chainsaw kills.
Get 20 kills using the berserk powerup in a single level.
Kill 4 enemies in 1 shot with the Super Shotgun.
Complete a level on Nightmare difficulty.
Finish a level with 200% armor and 200% health.
Reach the end of 'DOOM'.
Kill 5 enemies in 5 seconds with the Plasma Rifle.
Gib three or more enemies with a single rocket explosion.
Crush a corpse in a door.
Kill only a single enemy with a BFG9000 blast.
Shoot 200 bullets consecutively with the Chaingun.
Get 25 kills with your Fists in a single level.
Finish a level with 100% items picked up.
Complete any monster-filled level with 100% kills without getting hurt on Ultra-Violence or higher.
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.
Kill 2 enemies with a single barrel explosion.
Get 3 multi-kills with the Shotgun.
Find a secret area.
Cause an enemy to kill another enemy.
