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

Acid Reflex

Kill an acid antlion worker.
Unlocked 10 Jan @ 7:33pm

Get Some Grub

Squish every antlion grub in Episode Two.
Unlocked 6 Feb @ 5:22pm

Piñata Party

Find and break every web cache in Episode Two.
Unlocked 11 Jan @ 12:19pm

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 10 Jan @ 7:56pm

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 13 Jan @ 1:34pm

Hit and Run

Run over 20 enemies with the car in Episode Two.
Unlocked 15 Jan @ 1:29pm

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 13 Jan @ 3:22pm

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.
Unlocked 14 Jan @ 3:51pm

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 14 Jan @ 4:20pm

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 14 Jan @ 5:44pm

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked 14 Jan @ 5:58pm

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 14 Jan @ 4:43pm

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 14 Jan @ 5:31pm

Little Rocket Man

Send the garden gnome into space.
Unlocked 14 Jan @ 6:33pm

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 15 Jan @ 12:48pm

Neighborhood Watch

Save all buildings outside the missile silo from destruction.
Unlocked 15 Jan @ 2:26pm

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 15 Jan @ 2:26pm

Payback

Kill a Hunter with its own flechettes.
Unlocked 13 Jan @ 3:21pm

Bone Breaker

Kill 30 enemies with thrown physics objects.
Unlocked 13 Jan @ 2:12pm

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 10 Jan @ 7:48pm

Hot Potat0wned

Kill a Combine soldier with his own grenade.
Unlocked 6 Feb @ 5:34pm

Grave Robber

Steal a Zombine's grenade.
Unlocked 11 Jan @ 11:05am

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 10 Jan @ 6:48pm