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

Acid Reflex

Kill an acid antlion worker.
Unlocked 3 Oct, 2015 @ 7:21am

Get Some Grub

Squish every antlion grub in Episode Two.
Unlocked 5 Nov @ 4:40pm

Piñata Party

Find and break every web cache in Episode Two.
Unlocked 5 Nov @ 4:26pm

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 3 Oct, 2015 @ 7:43am

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 3 Oct, 2015 @ 8:42am

Hit and Run

Run over 20 enemies with the car in Episode Two.
Unlocked 3 Oct, 2015 @ 10:07am

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 3 Oct, 2015 @ 9:32am

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.
Unlocked 6 Nov @ 1:40pm

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 3 Oct, 2015 @ 10:05am

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 6 Nov @ 2:39pm

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked 3 Oct, 2015 @ 10:38am

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 3 Oct, 2015 @ 10:09am

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 3 Oct, 2015 @ 10:27am

Little Rocket Man

Send the garden gnome into space.
Unlocked 6 Nov @ 2:53pm

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 3 Oct, 2015 @ 11:01am

Neighborhood Watch

Save all buildings outside the missile silo from destruction.
Unlocked 6 Nov @ 4:04pm

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 3 Oct, 2015 @ 11:33am

Payback

Kill a Hunter with its own flechettes.
Unlocked 6 Nov @ 12:57pm

Bone Breaker

Kill 30 enemies with thrown physics objects.
Unlocked 6 Nov @ 12:22pm

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 3 Oct, 2015 @ 7:33am

Hot Potat0wned

Kill a Combine soldier with his own grenade.
Unlocked 6 Nov @ 1:56pm

Grave Robber

Steal a Zombine's grenade.
Unlocked 3 Oct, 2015 @ 9:05am

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 5 Nov @ 1:49pm