Kill one of every enemy.
Immolate a total of 30 arachnoid enemies with the Incinerator.
Obliterate 50 enemies with a single shot of the Calamity Blade.
Kill 4 enemies in 1 shot with the Super Shotgun.
Complete any monster-filled level with 100% kills, items, and secrets.
Crush a corpse in a door.
Finish a level with 100% items picked up.
Find a secret level.
Find a secret area.
Get 20 kills using the berserk powerup in a single level.
Kill 5 enemies in 5 seconds with the Plasma Rifle.
Gib three or more enemies with a single rocket explosion.
Complete any monster-filled level with 100% kills without taking any damage on Ultra-Violence or higher.
Finish a level with 200% armor and 200% health.
Kill 2 enemies with a single barrel explosion.
Shoot 200 bullets consecutively with the Chaingun.
Get 3 multi-kills with the Shotgun.
Get 100 Chainsaw kills.
Get 25 kills with your Fists in a single level.
Finish off a Cyberdemon with the Pistol.
Kill all monsters in any monster-filled level on 'Hurt me plenty' or higher.
Kill only a single enemy with a BFG9000 blast.
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'.
Reach the end of 'Master Levels for DOOM II'.
Reach the end of 'DOOM II'.
Complete 8 different levels sequentially under par time without dying on Ultra-Violence or higher.
Complete a level on Nightmare difficulty.
Reach the end of 'DOOM'.
Cause an enemy to kill another enemy.
650
15421
1495539
275631
10250
2111
2655
405