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21 of 23 (91%) achievements earned:
Personal Achievements
 

Acid Reflex

Kill an acid antlion worker.
Unlocked 5 Dec, 2010 @ 7:52am

Piñata Party

Find and break every web cache in Episode Two.
Unlocked 7 Dec, 2010 @ 8:51am

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 5 Dec, 2010 @ 9:12am

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 7 Dec, 2010 @ 8:51am

Hit and Run

Run over 20 enemies with the car in Episode Two.
Unlocked 11 Aug, 2017 @ 11:37am

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 10 Dec, 2010 @ 9:53am

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.
Unlocked 11 Dec, 2010 @ 11:53am

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 11 Dec, 2010 @ 12:09pm

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 11 Dec, 2010 @ 12:43pm

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked 11 Dec, 2010 @ 12:50pm

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 11 Dec, 2010 @ 12:17pm

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 11 Dec, 2010 @ 12:39pm

Little Rocket Man

Send the garden gnome into space.
Unlocked 12 Dec, 2010 @ 6:38am

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 12 Dec, 2010 @ 3:27am

Neighborhood Watch

Save all buildings outside the missile silo from destruction.
Unlocked 12 Dec, 2010 @ 6:20am

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 12 Dec, 2010 @ 6:20am

Payback

Kill a Hunter with its own flechettes.
Unlocked 10 Dec, 2010 @ 9:51am

Bone Breaker

Kill 30 enemies with thrown physics objects.
Unlocked 7 Dec, 2010 @ 8:18am

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 5 Dec, 2010 @ 9:01am

Hot Potat0wned

Kill a Combine soldier with his own grenade.
Unlocked 10 Dec, 2010 @ 10:10am

Grave Robber

Steal a Zombine's grenade.
Unlocked 4 Dec, 2010 @ 8:17am



Get Some Grub

Squish every antlion grub in Episode Two.

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.