13 Achievements
Attica! Destroy the gunship in the hospital attic.
169 achievers
Car Crusher Use the cars to squash 15 antlions in Episode One.
81 achievers
Citizen Escort Don't let any citizens die when escorting them to the escape train.
107 achievers
Conservationist Kill five enemies with the same energy ball.
41 achievers
Containment Contain the Citadel core.
203 achievers
Elevator Action Survive long enough to get on the parking garage elevator.
178 achievers
Escape From City 17 Escape City 17 with Alyx.
160 achievers
Live Bait Help Alyx snipe 30 enemies in Episode One.
112 achievers
Pacifist Contain the Citadel core without killing any stalkers.
60 achievers
The One Free Bullet Finish the game firing exactly one bullet. Grenade, crowbar, rocket, and Gravity Gun kills are okay!
43 achievers
Think Fast! Kill an Elite Soldier with his own energy ball.
111 achievers
Watch Your Head! Make it to the bottom of the Citadel's main elevator shaft in one piece.
207 achievers
Zombie-que Use flares to light 15 zombies on fire.
42 achievers