Complete Strogg Outpost on any difficulty.
Complete Strogg Outpost on hard with 100% kills and secrets.
Complete Outer Base on any difficulty.
Complete Outer Base on hard with 100% kills and secrets.
Complete Installation on any difficulty.
Complete Installation on hard with 100% kills and secrets.
Complete Comm Center on any difficulty.
Complete Comm Center on hard with 100% kills and secrets.
Complete Detention Center on any difficulty.
Complete Detention Center on hard with 100% kills and secrets.
Complete Security Complex on any difficulty.
Complete Security Complex on hard with 99% kills and 100% secrets.
Complete Torture Chambers on any difficulty.
Complete Torture Chambers on hard with 100% kills and secrets.
Complete Guard House on any difficulty.
Complete Guard House on hard with 100% kills and secrets.
Complete Grid Control on any difficulty.
Complete Grid Control on hard with 100% kills and secrets.
Complete Powerplant on any difficulty.
Complete Powerplant on hard with 99% kills and 100% secrets.
Complete The Reactor on any difficulty.
Complete The Reactor on hard with 100% kills and secrets.
Complete Toxic Waste Dump on any difficulty.
Complete Toxic Waste Dump on hard with 100% kills and secrets.
Complete Pumping Station 1 on any difficulty.
Complete Pumping Station 1 on hard with 100% kills and secrets.
Complete Pumping Station 2 on any difficulty.
Complete Pumping Station 2 on hard with 99% kills and 100% secrets.
Complete Waste Disposal Area on any difficulty.
Complete Waste Disposal Area on hard with 99% kills and 100% secrets.
Complete Defence Command on any difficulty.
Complete Defence Command on hard with 100% kills and secrets.
Complete Research Lab on any difficulty.
Complete Research Lab on hard with 99% kills and 100% secrets.
Complete Gravity Booster on any difficulty.
Complete Gravity Booster on hard with 100% kills.
Complete Inner Chamber on any difficulty.
Complete Inner Chamber on hard with 100% kills.
Complete Final Showdown on any difficulty.
Complete Final Showdown on hard.
Obtain the shotgun.
Obtain the super shotgun.
Obtain the machinegun.
Obtain the chaingun.
Obtain the grenade launcher.
Obtain the rocket launcher.
Obtain the hyper blaster.
Obtain the railgun.
Obtain the BFG.
Complete Strogg Outpost with only the blaster, on Hard, with 100% kills, and without getting hurt.