Finish Nuclear Plant (level 2).
Finish Toxin Refinery (level 3).
Finish Hangar (level 1).
Finish Command Control (level 4).
Finish Phobos Lab (level 5).
Finish Central Processing (level 6).
Finish Computer Station (level 7).
Finish Military Base (E1M9).
Finish Deimos Anomaly (level 9).
Finish Containment Area (level 10).
Finish Refinery (level 11).
Finish Deimos Lab (level 12).
Finish Command Center (level 13).
Finish Halls of the Damned (level 14).
Finish Spawning Vats (level 15).
Finish Tower of Babel (level 16).
Finish Hell's Keep (level 17).
Finish Pandemonium (level 18).
Finish House of Pain (level 19).
Finish Unholy Cathedral (level 20).
Finish Limbo (level 22).
Finish Dis (level 23).
Have 200 Health.
Have 200 Armor.
Have 200 Health and Armor at the same time.
Find a Chainsaw.
Find a Shotgun.
Find a Chaingun.
Find a Rocket Launcher.
Find a Plasma Rifle.
Find a big frickin' gun.
Finish Hangar under the par time of 0:30. (Hurt Me Plenty or harder)
Finish Hangar on Nightmare difficulty.
Finish Nuclear Plant under the par time of 1:15. (Hurt Me Plenty or harder)
Finish Nuclear Plant on Nightmare difficulty.
Finish Toxin Refinery under the par time of 2:00. (Hurt Me Plenty or harder)
Finish Toxin Refinery on Nightmare difficulty.
Finish Military Base under the par time of 2:45. (Hurt Me Plenty or harder)
Finish Military Base on Nightmare difficulty.
Finish Command Control under the par time of 1:30. (Hurt Me Plenty or harder)
Finish Command Control on Nightmare difficulty.
Finish Phobos Lab under the par time of 2:45. (Hurt Me Plenty or harder)
Finish Phobos Lab on Nightmare difficulty.
Finish Central Processing under the par time of 3:00. (Hurt Me Plenty or harder)
Finish Central Processing on Nightmare difficulty.
Finish Computer Station under the par time of 3:00. (Hurt Me Plenty or harder)
Finish Computer Station on Nightmare difficulty.
Finish Phobos Anomaly under the par time of 3:00. (Hurt Me Plenty or harder)
Finish Phobos Anomaly on Nightmare difficulty.
Finish Deimos Anomaly under the par time of 1:30. (Hurt Me Plenty or harder)
Finish Deimos Anomaly on Nightmare difficulty.
Finish Containment Area under the par time of 1:30. (Hurt Me Plenty or harder)
Finish Containment Area on Nightmare difficulty.
Finish Refinery under the par time of 1:30. (Hurt Me Plenty or harder)
Finish Refinery on Nightmare difficulty.
Finish Deimos Lab under the par time of 2:00. (Hurt Me Plenty or harder)
Finish Deimos Lab on Nightmare difficulty.
Finish Command Center under the par time of 1:30. (Hurt Me Plenty or harder)
Finish Command Center on Nightmare difficulty.
Finish Halls of the Damned under the par time of 6:00. (Hurt Me Plenty or harder)
Finish Halls of the Damned on Nightmare difficulty.
Finish Spawning Vats under the par time of 4:00. (Hurt Me Plenty or harder)
Finish Spawning Vats on Nightmare difficulty.
Finish Tower of Babel under the par time of 3:00. (Hurt Me Plenty or harder)
Finish Tower of Babel on Nightmare difficulty.
Finish Hell's Keep under the par time of 1:30. (Hurt Me Plenty or harder)
Finish Hell's Keep on Nightmare difficulty.
Finish Pandemonium under the par time of 1:30. (Hurt Me Plenty or harder)
Finish Pandemonium on Nightmare difficulty.
Finish House of Pain under the par time of 2:30. (Hurt Me Plenty or harder)
Finish House of Pain on Nightmare difficulty.
Finish Unholy Cathedral under the par time of 1:30. (Hurt Me Plenty or harder)
Finish Unholy Cathedral on Nightmare difficulty.
Finish Mt. Erebus under the par time of 1:30. (Hurt Me Plenty or harder)
Finish Mt. Erebus on Nightmare difficulty.
Finish Limbo under the par time of 2:45. (Hurt Me Plenty or harder)
Finish Limbo on Nightmare difficulty.
Finish Dis on Nightmare difficulty.
Kill 10 monsters during a single Invulnerability power-up.
Kill 20 monsters during a single Berserk power-up. (Do not switch weapons from fists)
Get 100% kills, items, and secrets on any level. (Hurt Me Plenty or harder)
Finish Phobos Anomaly (level 8).
Finish Mt. Erebus (level 21).