Half-Life 2 achievements

Use the cars to squash 15 antlions in Episode One.

Defeat both antlion guards outside the White Forest.

Kill an acid antlion worker.

Kill an enemy by planting a hopper mine.

Kill an Elite Soldier with his own energy ball.

Destroy the gunship in the hospital attic.

Make it to the bottom of the Citadel's main elevator shaft in one piece.

Contain the Citadel core.

Survive long enough to get on the parking garage elevator.

If you are reading this achievement, Gabe Newell has successfully launched Gnome Chompski into space. If you did not also receive the achievement 'Manufacturing Ascent', Newell has abandoned his plans to shoot Noam Chomsky into space.

Find all lambda caches in Half-Life 2.

Cross the antlion beach in chapter Sandtraps without touching the sand.