Contain the Citadel core.
Contain the Citadel core without killing any stalkers.
Don't let any citizens die when escorting them to the escape train.
Escape City 17 with Alyx.
Finish the game firing exactly one bullet. Grenade, crowbar, rocket, and Gravity Gun kills are okay!
Survive long enough to get on the parking garage elevator.
Destroy the gunship in the hospital attic.
Make it to the bottom of the Citadel's main elevator shaft in one piece.
Use the cars to squash 15 antlions in Episode One.
Help Alyx snipe 30 enemies in Episode One.
Use flares to light 15 zombies on fire.
Kill an Elite Soldier with his own energy ball.
Kill five enemies with the same energy ball.
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