Complete "Hangar"
Complete "Nuclear Plant"
Complete "Toxin Refinery"
Complete "Command Control"
Complete "Phobos Lab"
Complete "Central Processing"
Complete "Computer Station"
Complete "Phobos Anomaly"
Complete "Deimos Anomaly"
Complete "Containment Area"
Complete "Refinery"
Complete "Deimos Lab"
Complete "Command Center"
Complete "Halls of the Damned"
Complete "Spawning Vats"
Complete "Tower of Babel"
Complete "Hell Keep"
Complete "Pandemonium"
Complete "House of Pain"
Complete "Unholy Cathedral"
Complete "Mt. Erebus"
Complete "Limbo"
Complete "Dis"
Complete "Military Base"
Complete "Toxin Refinery" with the Secret Exit
Complete "Hangar" on Ultra-Violence or higher
Complete "Nuclear Plant" on Ultra-Violence or higher
Complete "Toxin Refinery" on Ultra-Violence or higher
Complete "Command Control" on Ultra-Violence or higher
Complete "Phobos Lab" on Ultra-Violence or higher
Complete "Central Processing" on Ultra-Violence or higher
Complete "Computer Station" on Ultra-Violence or higher
Complete "Phobos Anomaly" on Ultra-Violence or higher
Complete "Deimos Anomaly" on Ultra-Violence or higher
Complete "Containment Area" on Ultra-Violence or higher
Complete "Refinery" on Ultra-Violence or higher
Complete "Deimos Lab" on Ultra-Violence or higher
Complete "Command Center" on Ultra-Violence or higher
Complete "Halls of the Damned" on Ultra-Violence or higher
Complete "Spawning Vats" on Ultra-Violence or higher
Complete "Tower of Babel" on Ultra-Violence or higher
Complete "Hell Keep" on Ultra-Violence or higher
Complete "Pandemonium" on Ultra-Violence or higher
Complete "House of Pain" on Ultra-Violence or higher
Complete "Unholy Cathedral" on Ultra-Violence or higher
Complete "Mt. Erebus" on Ultra-Violence or higher
Complete "Limbo" on Ultra-Violence or higher
Complete "Dis" on Ultra-Violence or Higher
Complete "Military Base" on Ultra-Violence or higher
Obtain the Shotgun
Obtain the Chaingun
Obtain the Rocket Launcher
Obtain the Plasma Rifle
Obtain the BFG-9000
Obtain a Chainsaw
Obtain a Berserk Pack
Complete any map with 100% Items
Complete "Hangar" with 100% Kills and Secrets
Complete "Nuclear Plant" with 100% Kills and Secrets
Complete "Toxin Refinery" with 100% Kills and Secrets
Complete "Command Control" with 100% Kills and Secrets
Complete "Phobos Lab" with 100% Kills and Secrets
Complete "Control Processing" with 100% Kills and Secrets
Complete "Computer Station" with 100% Kills and Secrets
Complete "Phobos Anomaly" with 100% Kills
Complete "Deimos Anomaly" with 100% Kills & Secrets
Complete "Containment Area" with 80% Kills and Secrets
Complete "Refinery" with 100% Kills and Secrets
Complete "Deimos Lab" with 100% Kills and Secrets
Complete "Command Center" with 100% Kills and Secrets
Complete "Halls of the Damned" with 94% Kills and 100% Secrets
Complete "Spawning Vats" with 100% Kills and Secrets
Complete "Tower of Babel" with 100% Kills and Secrets
Complete "Hell Keep" with 100% Kills and Secrets
Complete "Pandemonium" with 100% Kills and Secrets
Complete "House of Pain" with 100% Kills and Secrets
Complete "Unholy Cathedral" with 100% Kills and Secrets
Complete "Mr. Erebus" with 100% Kills and Secrets
Complete "Limbo" with 100% Kills and Secrets
Complete "Dis" with 100% Kills
Complete "Military Base" with 100% Kills and Secret
Complete any 5 maps on Nightmare! in one session
Complete 5 maps in a row without dying on Hurt Me Plenty or higher
Complete a level at the smallest screen size from start to finish
Complete a level at the biggest screen size from start to finish
Get a total of 9 Demons killed with the berserk pack obtained without punching or changing from the fists in Dis
Complete "Hangar" without killing an enemy on Hurt Me Plenty or higher
Have 200% Health and 200% Armor at the same time