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15 of 23 (65%) achievements earned:
Personal Achievements
 

Acid Reflex

Kill an acid antlion worker.
Unlocked 15 Nov @ 10:22am

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 15 Nov @ 10:42am

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 15 Nov @ 11:29am

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 16 Nov @ 3:52am

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 16 Nov @ 4:16am

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 16 Nov @ 4:37am

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked 19 Nov @ 9:32am

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 16 Nov @ 4:21am

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 16 Nov @ 4:33am

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 19 Nov @ 9:58am

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 23 Nov @ 6:13am

Bone Breaker

Kill 30 enemies with thrown physics objects.
Unlocked 16 Nov @ 4:09am

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 15 Nov @ 10:35am

Grave Robber

Steal a Zombine's grenade.
Unlocked 15 Nov @ 11:41am

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 29 Oct @ 9:43am



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.

Payback

Kill a Hunter with its own flechettes.

Hot Potat0wned

Kill a Combine soldier with his own grenade.