25.77%
Zombie-que
Use flares to light 15 zombies on fire.
26.43%
Conservationist
Kill five enemies with the same energy ball.
27.81%
The One Free Bullet
Finish the game firing exactly one bullet. Grenade, crowbar, rocket, and Gravity Gun kills are okay!
29.81%
Pacifist
Contain the Citadel core without killing any stalkers.
39.95%
Car Crusher
Use the cars to squash 15 antlions in Episode One.
47.25%
Think Fast!
Kill an Elite Soldier with his own energy ball.
55.73%
Live Bait
Help Alyx snipe 30 enemies in Episode One.
59.03%
Citizen Escort
Don't let any citizens die when escorting them to the escape train.
81.70%
Escape From City 17
Escape City 17 with Alyx.
83.90%
Attica!
Destroy the gunship in the hospital attic.
88.02%
Elevator Action
Survive long enough to get on the parking garage elevator.
94.34%
Containment
Contain the Citadel core.