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14 of 23 (61%) achievements earned:
Personal Achievements
 

Acid Reflex

Kill an acid antlion worker.
Unlocked May 16 @ 7:19pm

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked May 16 @ 7:41pm

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked May 16 @ 9:20pm

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked May 16 @ 10:06pm

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked May 23 @ 1:16pm

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked May 23 @ 1:47pm

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked May 23 @ 1:52pm

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked May 23 @ 1:24pm

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked May 23 @ 1:39pm

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked May 23 @ 2:13pm

Bone Breaker

Kill 30 enemies with thrown physics objects.
Unlocked May 23 @ 1:10pm

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked May 16 @ 7:30pm

Grave Robber

Steal a Zombine's grenade.
Unlocked May 16 @ 9:31pm

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 May 16 @ 6:58pm



Get Some Grub

Squish every antlion grub in Episode Two.

Piñata Party

Find and break every web cache in Episode Two.

Hit and Run

Run over 20 enemies with the car in Episode Two.

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.

Little Rocket Man

Send the garden gnome into space.

Neighborhood Watch

Save all buildings outside the missile silo from destruction.

Defense of the Armament

Save the missile silo from the Combine offensive.

Payback

Kill a Hunter with its own flechettes.

Hot Potat0wned

Kill a Combine soldier with his own grenade.