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

Acid Reflex

Kill an acid antlion worker.
Unlocked 31 Jan, 2011 @ 11:14am

Get Some Grub

Squish every antlion grub in Episode Two.
Unlocked 23 May, 2014 @ 12:07pm

Piñata Party

Find and break every web cache in Episode Two.
Unlocked 22 Jan, 2020 @ 10:41am

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 1 Aug, 2011 @ 9:07am

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 1 Aug, 2011 @ 11:14am

Hit and Run

Run over 20 enemies with the car in Episode Two.
Unlocked 23 Nov, 2012 @ 5:08am

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 22 Nov, 2012 @ 6:57am

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.
Unlocked 23 Jan, 2020 @ 9:53am

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 23 Nov, 2012 @ 4:48am

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 23 Nov, 2012 @ 5:39am

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked 23 Nov, 2012 @ 5:45am

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 23 Nov, 2012 @ 5:07am

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 23 Nov, 2012 @ 5:27am

Little Rocket Man

Send the garden gnome into space.
Unlocked 23 Jan, 2020 @ 10:49am

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 23 Nov, 2012 @ 6:16am

Neighborhood Watch

Save all buildings outside the missile silo from destruction.
Unlocked 10 Apr, 2020 @ 3:53am

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 23 Nov, 2012 @ 6:54am

Payback

Kill a Hunter with its own flechettes.
Unlocked 22 Nov, 2012 @ 6:57am

Bone Breaker

Kill 30 enemies with thrown physics objects.
Unlocked 1 Aug, 2011 @ 11:19am

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 31 Jan, 2011 @ 11:28am

Hot Potat0wned

Kill a Combine soldier with his own grenade.
Unlocked 29 Jan, 2020 @ 11:37am

Grave Robber

Steal a Zombine's grenade.
Unlocked 22 Nov, 2012 @ 6:20am

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 30 Nov, 2020 @ 4:48am