Escape via the helicopter
Escape via the liferaft
Escape via the sub
Win the game against the Brute
Win the game against the Hunter
Win the game against the Fiend
Stun a monster with the fire extinguisher
Trigger a Hunter trap with an item
Activate the main steam valve
Hit the Brute with a flare
Power 2 additional areas in one playthrough
Gain access to a barricaded room
Get killed by all 3 monsters
Lock a monster in a power-locked room.
Get killed by a monster after falling on a pit trap
Have 6 glowsticks at once.