Half-Life 2 achievements

Survive the ambush at White Forest Inn.

Secure the launch doors on missile silo 2.

Kill an enemy by planting a hopper mine.

Save the missile silo from the Combine offensive.

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.

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

Destroy the Combine Autogun in the junkyard.

Survive the Hunter ambush with Alyx.

Kill an acid antlion worker.

Find every radar cache in chapter Under The Radar.

Defeat both antlion guards outside the White Forest.

Beat DOG in a race to the White Forest base.