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

Acid Reflex

Kill an acid antlion worker.
Unlocked 17 Oct, 2013 @ 4:16am

Get Some Grub

Squish every antlion grub in Episode Two.
Unlocked 25 Oct, 2013 @ 1:15am

Piñata Party

Find and break every web cache in Episode Two.
Unlocked 24 Oct, 2013 @ 11:27pm

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 19 Oct, 2013 @ 2:46am

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 19 Oct, 2013 @ 3:39am

Hit and Run

Run over 20 enemies with the car in Episode Two.
Unlocked 24 Oct, 2013 @ 1:19am

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 20 Oct, 2013 @ 2:59am

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.
Unlocked 20 Oct, 2013 @ 9:00pm

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 20 Oct, 2013 @ 9:08pm

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 24 Oct, 2013 @ 12:21am

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked 24 Oct, 2013 @ 12:27am

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 24 Oct, 2013 @ 12:07am

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 24 Oct, 2013 @ 12:17am

Little Rocket Man

Send the garden gnome into space.
Unlocked 24 Oct, 2013 @ 12:37am

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 24 Oct, 2013 @ 12:53am

Neighborhood Watch

Save all buildings outside the missile silo from destruction.
Unlocked 24 Oct, 2013 @ 10:42pm

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 24 Oct, 2013 @ 10:42pm

Payback

Kill a Hunter with its own flechettes.
Unlocked 20 Oct, 2013 @ 2:56am

Bone Breaker

Kill 30 enemies with thrown physics objects.
Unlocked 19 Oct, 2013 @ 3:57am

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 19 Oct, 2013 @ 2:36am

Hot Potat0wned

Kill a Combine soldier with his own grenade.
Unlocked 20 Oct, 2013 @ 9:11pm

Grave Robber

Steal a Zombine's grenade.
Unlocked 17 Oct, 2013 @ 3:57am

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 24 Dec, 2020 @ 12:48am