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

Acid Reflex

Kill an acid antlion worker.
Unlocked 12 Aug, 2009 @ 3:53pm

Get Some Grub

Squish every antlion grub in Episode Two.
Unlocked 5 Feb, 2012 @ 3:03pm

Piñata Party

Find and break every web cache in Episode Two.
Unlocked 2 Feb, 2012 @ 5:22pm

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 12 Aug, 2009 @ 4:10pm

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 13 Aug, 2009 @ 2:56am

Hit and Run

Run over 20 enemies with the car in Episode Two.
Unlocked 16 Jun, 2010 @ 9:48am

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 13 Aug, 2009 @ 4:32am

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 13 Aug, 2009 @ 5:37am

Cache Checker

Find every radar cache in chapter Under The Radar.

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked 13 Aug, 2009 @ 6:04am

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 13 Aug, 2009 @ 5:37am

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 13 Aug, 2009 @ 6:04am

Little Rocket Man

Send the garden gnome into space.
Unlocked 6 Feb, 2012 @ 9:34am

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 13 Aug, 2009 @ 7:06am

Neighborhood Watch

Save all buildings outside the missile silo from destruction.
Unlocked 6 Feb, 2012 @ 10:59am

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 13 Aug, 2009 @ 9:19am

Payback

Kill a Hunter with its own flechettes.
Unlocked 13 Aug, 2009 @ 9:19am

Bone Breaker

Kill 30 enemies with thrown physics objects.

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 12 Aug, 2009 @ 4:10pm

Hot Potat0wned

Kill a Combine soldier with his own grenade.
Unlocked 6 Feb, 2012 @ 9:46am

Grave Robber

Steal a Zombine's grenade.
Unlocked 12 Jun, 2010 @ 4:30pm

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 28 Mar, 2022 @ 10:55am