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

Acid Reflex

Kill an acid antlion worker.

Get Some Grub

Squish every antlion grub in Episode Two.
Unlocked 29 Oct, 2013 @ 12:55pm

Piñata Party

Find and break every web cache in Episode Two.
Unlocked 29 Oct, 2013 @ 12:44pm

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.

Twofer

Defeat both antlion guards outside the White Forest.

Hit and Run

Run over 20 enemies with the car in Episode Two.

Meet the Hunters

Survive the Hunter ambush with Alyx.

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.
Unlocked 29 Oct, 2013 @ 2:08pm

Gunishment!

Destroy the Combine Autogun in the junkyard.

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 15 Oct, 2009 @ 5:20pm

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.

Little Rocket Man

Send the garden gnome into space.
Unlocked 15 Oct, 2009 @ 4:47pm

Secondary Silo Secured

Secure the launch doors on missile silo 2.

Neighborhood Watch

Save all buildings outside the missile silo from destruction.
Unlocked 26 Apr @ 11:16am

Defense of the Armament

Save the missile silo from the Combine offensive.

Payback

Kill a Hunter with its own flechettes.

Bone Breaker

Kill 30 enemies with thrown physics objects.
Unlocked 12 Sep, 2009 @ 3:16pm

Deadly Harvest

Kill an enemy by planting a hopper mine.

Hot Potat0wned

Kill a Combine soldier with his own grenade.
Unlocked 15 Oct, 2009 @ 4:47pm

Grave Robber

Steal a Zombine's grenade.

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 2 Mar @ 12:54am