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

Acid Reflex

Kill an acid antlion worker.
Unlocked 3 Apr, 2011 @ 3:18am

Get Some Grub

Squish every antlion grub in Episode Two.
Unlocked 5 Mar, 2023 @ 5:34am

Piñata Party

Find and break every web cache in Episode Two.
Unlocked 5 Mar, 2023 @ 6:02am

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 1 Jul, 2012 @ 2:47am

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 1 Jul, 2012 @ 5:36am

Hit and Run

Run over 20 enemies with the car in Episode Two.
Unlocked 1 Jul, 2012 @ 12:26pm

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 1 Jul, 2012 @ 8:00am

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.
Unlocked 26 Feb, 2023 @ 10:25am

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 1 Jul, 2012 @ 9:37am

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 1 Jul, 2012 @ 10:36am

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked 1 Jul, 2012 @ 11:04am

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 1 Jul, 2012 @ 9:57am

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 1 Jul, 2012 @ 10:24am

Little Rocket Man

Send the garden gnome into space.
Unlocked 3 Mar, 2023 @ 6:22am

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 1 Jul, 2012 @ 11:45am

Neighborhood Watch

Save all buildings outside the missile silo from destruction.
Unlocked 3 Mar, 2023 @ 10:51am

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 1 Jul, 2012 @ 12:47pm

Payback

Kill a Hunter with its own flechettes.
Unlocked 27 Feb, 2023 @ 8:35am

Bone Breaker

Kill 30 enemies with thrown physics objects.
Unlocked 26 Feb, 2023 @ 10:31am

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 26 Feb, 2023 @ 7:41am

Hot Potat0wned

Kill a Combine soldier with his own grenade.
Unlocked 3 Mar, 2023 @ 5:38am

Grave Robber

Steal a Zombine's grenade.
Unlocked 26 Feb, 2023 @ 7:58am

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 26 Feb, 2023 @ 5:15am