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12 of 22 (55%) Achievements Earned::
Kill an acid antlion worker.
Into the Breach
Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked: Dec 21, 2008 6:15pm
Defeat both antlion guards outside the White Forest.
Unlocked: Jul 27, 2012 8:31am
Meet the Hunters
Survive the Hunter ambush with Alyx.
Unlocked: Jul 28, 2012 11:18am
Destroy the Combine Autogun in the junkyard.
Unlocked: Jul 28, 2012 12:27pm
Find every radar cache in chapter Under The Radar.
Unlocked: Jul 28, 2012 11:35am
Gordon Propelled Rocket
Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked: Jul 28, 2012 12:16pm
Quiet Mountain Getaway
Survive the ambush at White Forest Inn.
Unlocked: Jul 30, 2012 5:13am
Secondary Silo Secured
Secure the launch doors on missile silo 2.
Unlocked: Jul 31, 2012 3:54am
Defense of the Armament
Save the missile silo from the Combine offensive.
Kill an enemy by planting a hopper mine.
Unlocked: Jul 27, 2012 7:42am