Melee a Lurker that is pouncing toward you

Complete Hope in Hadley's

Rescue a teammate from a Close Encounter

Purchase all Upgrades for a weapon

Complete One Bullet without setting off the alarm

Complete The Raven

Kill 10 Xenomorphs in a game with the M56A2 Smart Gun

Arm the emergency release and escape in under 2:30 on Sulaco Falls

Survive a Close Encounter with a Facehugger

Complete a Challenge

Collect a Legendary Weapon

Kill a Xenomorph climbing on the walls or ceiling