Half-Life 2 achievements

Secure the launch doors on missile silo 2.

Help Alyx snipe 30 enemies in Episode One.

Kill an enemy by planting a hopper mine.

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

Defeat both antlion guards outside the White Forest.

Kill an acid antlion worker.

Escape City 17 with Alyx.

Contain the Citadel core.

Destroy the gunship in the hospital attic.

Survive long enough to get on the parking garage elevator.

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

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.