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

Acid Reflex

Kill an acid antlion worker.
Unlocked 13 Jan, 2014 @ 5:14pm

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 13 Jan, 2014 @ 5:44pm

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 17 Jan, 2014 @ 12:07am

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 21 Jun, 2014 @ 8:04pm

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 21 Jun, 2014 @ 8:30pm

Little Rocket Man

Send the garden gnome into space.
Unlocked 21 Jun, 2014 @ 8:52pm

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 21 Jun, 2014 @ 9:07pm

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 29 Jun, 2014 @ 1:42am

Payback

Kill a Hunter with its own flechettes.
Unlocked 21 Jun, 2014 @ 8:27pm

Bone Breaker

Kill 30 enemies with thrown physics objects.
Unlocked 17 Jan, 2014 @ 12:25am

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 13 Jan, 2014 @ 5:34pm

Grave Robber

Steal a Zombine's grenade.
Unlocked 16 Jan, 2014 @ 4:41am



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.

Meet the Hunters

Survive the Hunter ambush with Alyx.

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.

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.

Gordon Propelled Rocket

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

Neighborhood Watch

Save all buildings outside the missile silo from destruction.

Hot Potat0wned

Kill a Combine soldier with his own 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.