Hangar
Complete level 1.
Plant
Complete level 2.
Toxin Refinery
Complete level 3(normal exit).
Command Control
Complete level 4
Phobos Lab
Complete level 5
Central Processing
Complete level 6.
Computer Station
Complete level 7.
Phobos Anomaly
Complete level 8.
Deimos Anomaly
Complete level 9.
Containment Area
Complete level 10.
Refinery
Complete level 11.
Deimos Lab
Complete level 12.
Command Center
Complete level 13.
Halls of the Damned
Complete level 14.
Spawning Vats
Complete level 15.
Fortress of Mystery
Reveal Level 16 (secret level)
Good Ending
Complete level 16 and beat the game
Do Not Enter
Reveal the hidden entrance to The Military Base
Military Base
Complete The Military Base on Hurt Me Plenty or Higher
Shotgun
Obtain the shotgun
RapidFire
Obtain the machinegun
Rocket Launcher
Obtain the Rocket Launcher
Batteries Not Included
Obtain the Plasma Gun
Hangar (UV)
Complete level 1 on Ultra-Violence or higher
Plant (UV)
Complete level 2 on Ultra-Violence or higher
Toxin Refinery (UV)
Complete level 3(normal exit) on Ultra-Violence or higher
Command Control (UV)
Complete level 4 on Ultra-Violence or higher
Phobos Lab (UV)
Complete level 5 on Ultra-Violence or higher
Central Processing (UV)
Complete level 6 on Ultra-Violence or higher
Computer Station (UV)
Complete level 7 on Ultra-Violence or higher
Phobos Anomaly (UV)
Complete level 8 on Ultra-Violence or higher
Deimos Anomaly (UV)
Complete level 9 on Ultra-Violence or higher
Containment Area (UV)
Complete level 10 on Ultra-Violence or higher
Refinery (UV)
Complete level 11 on Ultra-Violence or higher
Deimos Lab (UV)
Complete level 12 on Ultra-Violence or higher
Command Center (UV)
Complete level 13 on Ultra-Violence or higher
Halls of the Damned (UV)
Complete level 14 on Ultra-Violence or higher
Spawning Vats (UV)
Complete level 15 on Ultra-Violence or higher
Nightmare
Complete any level on Nightmare with 100% kills
I don't need help
Reach and beat level 16(secret level) while on Ultra-Violence or higher.
Super Charged
Have 200% health and 200% armor at the same time on Hurt Me Plenty or above
Military Base Deathless
Reach and Complete Military base (secret level) without dying on hurt me plenty or higher
Fortress of Mystery 100%
Complete Fortress of Mystery (secret level) with 100% Kills,Items and Secrets on hurt me plenty or higher
100% Hangar
Complete level 1 with 100% Kills, Items, and Secrets on Hurt Me Plenty or higher.
100% Plant
Complete level 2 with 100% Kills, Items, and Secrets on Hurt Me Plenty or higher.
100% Toxin Refinery
Complete level 3 with 100% Kills, Items, and Secrets on Hurt Me Plenty or higher.
100% Command Control
Complete level 4 with 100% Kills, Items, and Secrets on Hurt Me Plenty or higher.
100% Phobos Lab
Complete level 5 with 100% Kills, Items, and Secrets on Hurt Me Plenty or higher.
100% Central Processing
Complete level 6 with 100% Kills, Items, and Secrets on Hurt Me Plenty or higher.
100% Computer Station
Complete level 7 with 100% Kills, Items, and Secrets on Hurt Me Plenty or higher.
100% Phobos Anomaly
Complete level 8 with 100% Kills, Items, and Secrets on Hurt Me Plenty or higher.
100% Deimos Anomaly
Complete level 9 with 100% Kills, Items, and Secrets on Hurt Me Plenty or higher.
100% Containment Area
Complete level 10 with 84% Kills, 100% Items, and... 85% Secrets. (Thanks, inaccessible areas!) on Hurt Me Plenty or higher.
100% Refinery
Complete level 11 with 100% Kills, Items, and Secrets on Hurt Me Plenty or higher.
100% Deimos Lab
Complete level 12 with 100% Kills, Items, and Secrets on Hurt Me Plenty or higher.
100% Command Center
Complete level 13 with 100% Kills, Items, and Secrets on Hurt Me Plenty or higher.
100% Halls of the Damned
Complete level 14 with 90% Kills, 100% Items, and 100% Secrets on Hurt Me Plenty or higher.
100% Spawning Vats
Complete level 15 with 100% Kills, Items, and Secrets on Hurt Me Plenty or higher.
100% Military Base
Complete The Military Base with 100% Kills, Items, and Secrets on Hurt Me Plenty or Higher.