Half-Life 2 achievements

Run over 20 enemies with the car in Episode Two.

Beat DOG in a race to the White Forest base.

Use the cars to squash 15 antlions in Episode One.

Steal a Zombine's grenade.

Find every radar cache in chapter Under The Radar.

Kill an Elite Soldier with his own energy ball.

Unlock the rocket launcher lambda cache in chapter Under The Radar.

Save the missile silo from the Combine offensive.

Don't let any citizens die when escorting them to the escape train.

Survive the ambush at White Forest Inn.

Kill an enemy by planting a hopper mine.

Survive the Hunter ambush with Alyx.