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

Acid Reflex

Kill an acid antlion worker.
Unlocked 19 Oct, 2013 @ 8:42am

Get Some Grub

Squish every antlion grub in Episode Two.
Unlocked 20 Oct, 2013 @ 11:11am

Piñata Party

Find and break every web cache in Episode Two.
Unlocked 20 Oct, 2013 @ 10:57am

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 19 Oct, 2013 @ 9:02am

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 19 Oct, 2013 @ 10:39am

Hit and Run

Run over 20 enemies with the car in Episode Two.
Unlocked 20 Oct, 2013 @ 12:58pm

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 19 Oct, 2013 @ 11:52am

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.
Unlocked 20 Oct, 2013 @ 12:44pm

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 19 Oct, 2013 @ 12:38pm

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 19 Oct, 2013 @ 1:17pm

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked 19 Oct, 2013 @ 1:24pm

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 19 Oct, 2013 @ 12:49pm

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 19 Oct, 2013 @ 1:11pm

Little Rocket Man

Send the garden gnome into space.
Unlocked 20 Oct, 2013 @ 1:27pm

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 19 Oct, 2013 @ 1:58pm

Neighborhood Watch

Save all buildings outside the missile silo from destruction.
Unlocked 19 Oct, 2013 @ 3:07pm

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 19 Oct, 2013 @ 3:07pm

Payback

Kill a Hunter with its own flechettes.
Unlocked 20 Oct, 2013 @ 1:55pm

Bone Breaker

Kill 30 enemies with thrown physics objects.
Unlocked 20 Oct, 2013 @ 11:39am

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 19 Oct, 2013 @ 8:55am

Hot Potat0wned

Kill a Combine soldier with his own grenade.
Unlocked 20 Oct, 2013 @ 12:13pm

Grave Robber

Steal a Zombine's grenade.
Unlocked 19 Oct, 2013 @ 10:48am

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 20 Nov, 2020 @ 4:22am