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