Find a BFG in DOOM II single player

Complete all 'DOOM II Hell on Earth' levels on 'Ultra-Violence' or higher in single player

Complete the DOOM 3 single player campaign on Nightmare

Defeat Guardian boss in DOOM 3

Kill 5 enemies at once while in Hell Time in RoE

Get the BFG-9000 from Security Chief's office in DOOM 3

Complete DOOM Episode 3 on 'Hurt Me Plenty' or higher in single player

Find the id logo secret room in DOOM 3

Use the Artifact with Berserk ability to punch out 20 enemies in RoE

Complete the DOOM 3 single player campaign on Veteran

Complete DOOM Episode 4 on 'Hurt Me Plenty' or higher in single player

Complete the RoE campaign on Recruit

Defeat the Maledict boss in RoE

Complete a level without taking any damage in DOOM 3, RoE, or Lost Mission (except Mars City)

Kill 20 enemies with the fists/melee hands in DOOM 3

Complete the RoE campaign on Veteran

Open all storage lockers in DOOM 3

Blow up 50 barrels in the DOOM 3, RoE, or Lost Mission campaigns

Complete the Lost Mission campaign on Nightmare

Defeat Cyberdemon boss in DOOM 3

Defeat the Helltime Hunter in RoE

Collect every PDA in the RoE campaign

Get 2 demons to fight each other in DOOM 3, RoE, or Lost Mission

Complete the DOOM 3 single player campaign on Marine

Collect every PDA in DOOM 3

Find a secret area of a DOOM II level in single player

Complete the Lost Mission campaign on Veteran

Keep a Sentry Bot alive to its destination in DOOM 3, RoE, or Lost Mission (except Mars City)

Find the bloody handiwork of Betruger (in Delta 4 Hallway) in DOOM 3

Find all video logs in DOOM 3

Kill an enemy with 1 health remaining in DOOM 3, RoE, or Lost Mission

Defeat Sabaoth boss in DOOM 3

Complete all levels in 'DOOM II Hell on Earth' in single player

Defeat the Invulnerability Hunter in RoE

Complete any DOOM II level in single player

Complete the Lost Mission campaign on Recruit

Complete any level in Ultimate DOOM in singleplayer

Score 25000 on Super Turbo Turkey Puncher 3 in DOOM 3 or RoE

Complete the RoE campaign on Nightmare

Complete any DOOM level with 100% kills, items, and secrets in single player

Complete DOOM Episode 2 on 'Hurt Me Plenty' or higher in single player

Find the RAGE logo in the Lost Mission

Complete the RoE campaign on Marine

Kill the scientist trapped next to the Reactor Control Room in DOOM 3

Complete any DOOM level on 'Nightmare' in single player

Complete DOOM Episode 1 on 'Hurt Me Plenty' or higher in single player

Use the chainsaw to kill 20 enemies in DOOM 3

Complete the DOOM 3 single player campaign on Recruit

Complete all DOOM levels on 'Ultra-Violence' or higher in single player

Kill 2 Imps with one shotgun blast in DOOM 3, RoE, or Lost Mission

Use the Soul Cube to defeat 20 enemies in DOOM 3

Defeat the Vagary boss in DOOM 3

Defeat the Berserk Hunter in RoE

Complete any DOOM II level with 100% kills, items, and secrets in single player

Complete the Lost Mission campaign on Marine

Complete all levels in 'DOOM II No Rest for the Living' in single player

Collect every PDA in the Lost Mission campaign

Complete the DOOM 3 single player campaign in 10 hours or less

Kill 20 enemies with projectiles launched from the Grabber in RoE