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

Acid Reflex

Kill an acid antlion worker.
Unlocked 13 Feb @ 4:16pm

Get Some Grub

Squish every antlion grub in Episode Two.
Unlocked 13 Feb @ 9:42pm

Piñata Party

Find and break every web cache in Episode Two.
Unlocked 13 Feb @ 9:20pm

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 13 Feb @ 6:23pm

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 13 Feb @ 10:18pm

Hit and Run

Run over 20 enemies with the car in Episode Two.
Unlocked 14 Feb @ 2:41am

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 14 Feb @ 12:06am

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.
Unlocked 14 Feb @ 1:58am

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 14 Feb @ 2:33am

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 14 Feb @ 3:56am

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked 14 Feb @ 4:09am

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 14 Feb @ 2:55am

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 14 Feb @ 3:41am

Little Rocket Man

Send the garden gnome into space.
Unlocked 14 Feb @ 4:24am

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 14 Feb @ 5:53am

Neighborhood Watch

Save all buildings outside the missile silo from destruction.
Unlocked 14 Feb @ 6:50am

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 14 Feb @ 6:50am

Payback

Kill a Hunter with its own flechettes.
Unlocked 14 Feb @ 12:03am

Bone Breaker

Kill 30 enemies with thrown physics objects.
Unlocked 13 Feb @ 5:50pm

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 13 Feb @ 5:34pm

Hot Potat0wned

Kill a Combine soldier with his own grenade.
Unlocked 14 Feb @ 2:25am

Grave Robber

Steal a Zombine's grenade.
Unlocked 13 Feb @ 3:22pm

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 12 Feb @ 7:35pm