Half-Life 2 achievements

Survive the Hunter ambush with Alyx.

Destroy the Combine Autogun in the junkyard.

Help Alyx snipe 30 enemies in Episode One.

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.

Survive long enough to get on the parking garage elevator.

Contain the Citadel core.

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

Destroy the gunship in the hospital attic.

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.