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

Acid Reflex

Kill an acid antlion worker.
Unlocked 23 Sep, 2014 @ 5:54am

Get Some Grub

Squish every antlion grub in Episode Two.
Unlocked 23 Sep, 2014 @ 5:11pm

Piñata Party

Find and break every web cache in Episode Two.
Unlocked 23 Sep, 2014 @ 7:11am

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 23 Sep, 2014 @ 6:26am

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 23 Sep, 2014 @ 7:48am

Hit and Run

Run over 20 enemies with the car in Episode Two.
Unlocked 23 Sep, 2014 @ 2:20pm

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 23 Sep, 2014 @ 1:43pm

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.
Unlocked 23 Sep, 2014 @ 2:03pm

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 23 Sep, 2014 @ 2:14pm

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 23 Sep, 2014 @ 2:42pm

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked 23 Sep, 2014 @ 2:47pm

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 23 Sep, 2014 @ 2:22pm

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 23 Sep, 2014 @ 2:37pm

Little Rocket Man

Send the garden gnome into space.
Unlocked 23 Sep, 2014 @ 2:55pm

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 23 Sep, 2014 @ 3:07pm

Neighborhood Watch

Save all buildings outside the missile silo from destruction.
Unlocked 23 Sep, 2014 @ 3:47pm

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 23 Sep, 2014 @ 3:47pm

Payback

Kill a Hunter with its own flechettes.
Unlocked 23 Sep, 2014 @ 8:25am

Bone Breaker

Kill 30 enemies with thrown physics objects.
Unlocked 23 Sep, 2014 @ 8:04am

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 23 Sep, 2014 @ 6:15am

Hot Potat0wned

Kill a Combine soldier with his own grenade.
Unlocked 23 Sep, 2014 @ 2:11pm

Grave Robber

Steal a Zombine's grenade.
Unlocked 23 Sep, 2014 @ 5:39am

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 23 Nov, 2020 @ 11:09am