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12 of 23 (52%) achievements earned:
Personal Achievements
 

Acid Reflex

Kill an acid antlion worker.
Unlocked 26 Jun @ 3:48pm

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 27 Jun @ 12:41pm

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 27 Jun @ 1:35pm

Hit and Run

Run over 20 enemies with the car in Episode Two.
Unlocked 27 Jun @ 7:23pm

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 27 Jun @ 5:38pm

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 27 Jun @ 6:04pm

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked 27 Jun @ 6:29pm

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 27 Jun @ 6:19pm

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 27 Jun @ 6:48pm

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 27 Jun @ 7:39pm

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 27 Jun @ 12:40pm

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 26 Jun @ 3:31pm



Get Some Grub

Squish every antlion grub in Episode Two.

Piñata Party

Find and break every web cache in Episode Two.

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.

Cache Checker

Find every radar cache in chapter Under The Radar.

Gordon Propelled Rocket

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

Little Rocket Man

Send the garden gnome into space.

Neighborhood Watch

Save all buildings outside the missile silo from destruction.

Payback

Kill a Hunter with its own flechettes.

Bone Breaker

Kill 30 enemies with thrown physics objects.

Hot Potat0wned

Kill a Combine soldier with his own grenade.

Grave Robber

Steal a Zombine's grenade.