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22 of 23 (96%) achievements earned:
Personal Achievements
 

Acid Reflex

Kill an acid antlion worker.
Unlocked 17 Jan, 2016 @ 4:40am

Get Some Grub

Squish every antlion grub in Episode Two.
Unlocked 18 Jan, 2016 @ 1:19am

Piñata Party

Find and break every web cache in Episode Two.
Unlocked 17 Jan, 2016 @ 6:54am

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 17 Jan, 2016 @ 5:02am

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 17 Jan, 2016 @ 9:02am

Hit and Run

Run over 20 enemies with the car in Episode Two.
Unlocked 17 Jan, 2016 @ 10:34am

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 17 Jan, 2016 @ 9:44am

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.
Unlocked 17 Jan, 2016 @ 10:19am

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 17 Jan, 2016 @ 10:29am

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 17 Jan, 2016 @ 10:53am

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked 17 Jan, 2016 @ 10:59am

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 17 Jan, 2016 @ 10:35am

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 17 Jan, 2016 @ 10:49am

Little Rocket Man

Send the garden gnome into space.
Unlocked 17 Jan, 2016 @ 11:05am

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 17 Jan, 2016 @ 11:16am

Neighborhood Watch

Save all buildings outside the missile silo from destruction.
Unlocked 17 Jan, 2016 @ 12:00pm

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 17 Jan, 2016 @ 12:00pm

Payback

Kill a Hunter with its own flechettes.
Unlocked 17 Jan, 2016 @ 9:44am

Bone Breaker

Kill 30 enemies with thrown physics objects.
Unlocked 17 Jan, 2016 @ 9:20am

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 17 Jan, 2016 @ 4:52am

Hot Potat0wned

Kill a Combine soldier with his own grenade.
Unlocked 17 Jan, 2016 @ 9:57am

Grave Robber

Steal a Zombine's grenade.
Unlocked 17 Jan, 2016 @ 4:24am



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.