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22 of 23 (96%) achievements earned:
Personal Achievements
 

Acid Reflex

Kill an acid antlion worker.
Unlocked 18 Sep, 2013 @ 1:37am

Get Some Grub

Squish every antlion grub in Episode Two.
Unlocked 18 Sep, 2013 @ 6:40am

Piñata Party

Find and break every web cache in Episode Two.
Unlocked 18 Sep, 2013 @ 6:23am

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 18 Sep, 2013 @ 2:41am

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 18 Sep, 2013 @ 7:16am

Hit and Run

Run over 20 enemies with the car in Episode Two.
Unlocked 19 Sep, 2013 @ 3:19am

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 18 Sep, 2013 @ 9:34am

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.
Unlocked 19 Sep, 2013 @ 1:49am

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 19 Sep, 2013 @ 3:10am

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 19 Sep, 2013 @ 6:45am

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked 19 Sep, 2013 @ 8:11am

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 19 Sep, 2013 @ 3:33am

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 19 Sep, 2013 @ 6:31am

Little Rocket Man

Send the garden gnome into space.
Unlocked 19 Sep, 2013 @ 8:25am

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 19 Sep, 2013 @ 10:53am

Neighborhood Watch

Save all buildings outside the missile silo from destruction.
Unlocked 19 Sep, 2013 @ 11:49pm

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 19 Sep, 2013 @ 11:49pm

Payback

Kill a Hunter with its own flechettes.
Unlocked 19 Sep, 2013 @ 12:58am

Bone Breaker

Kill 30 enemies with thrown physics objects.
Unlocked 18 Sep, 2013 @ 2:30am

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 18 Sep, 2013 @ 2:33am

Hot Potat0wned

Kill a Combine soldier with his own grenade.
Unlocked 19 Sep, 2013 @ 12:53am

Grave Robber

Steal a Zombine's grenade.
Unlocked 18 Sep, 2013 @ 12:47am



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.