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23 of 23 (100%) achievements earned:
Personal Achievements
 

Acid Reflex

Kill an acid antlion worker.
Unlocked 28 Sep, 2010 @ 2:31am

Get Some Grub

Squish every antlion grub in Episode Two.
Unlocked 8 Jul, 2013 @ 10:09am

Piñata Party

Find and break every web cache in Episode Two.
Unlocked 2 Sep, 2011 @ 7:23am

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 28 Sep, 2010 @ 2:59am

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 3 Sep, 2011 @ 7:01am

Hit and Run

Run over 20 enemies with the car in Episode Two.
Unlocked 3 Sep, 2011 @ 8:34am

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 3 Sep, 2011 @ 7:51am

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.
Unlocked 3 Sep, 2011 @ 8:13am

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 3 Sep, 2011 @ 8:29am

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 3 Sep, 2011 @ 8:57am

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked 3 Sep, 2011 @ 9:03am

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 3 Sep, 2011 @ 8:35am

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 3 Sep, 2011 @ 8:52am

Little Rocket Man

Send the garden gnome into space.
Unlocked 3 Aug, 2013 @ 11:01am

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 3 Sep, 2011 @ 9:32am

Neighborhood Watch

Save all buildings outside the missile silo from destruction.
Unlocked 4 Aug, 2013 @ 3:19am

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 4 Aug, 2013 @ 3:19am

Payback

Kill a Hunter with its own flechettes.
Unlocked 3 Sep, 2011 @ 9:22am

Bone Breaker

Kill 30 enemies with thrown physics objects.
Unlocked 3 Sep, 2011 @ 7:59am

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 28 Sep, 2010 @ 2:49am

Hot Potat0wned

Kill a Combine soldier with his own grenade.
Unlocked 3 Aug, 2013 @ 9:15am

Grave Robber

Steal a Zombine's grenade.
Unlocked 2 Sep, 2011 @ 6:33am

Gnome Alone

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.
Unlocked 20 Nov, 2020 @ 2:22am