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

Acid Reflex

Kill an acid antlion worker.
Unlocked 9 Jul, 2013 @ 2:14pm

Get Some Grub

Squish every antlion grub in Episode Two.
Unlocked 7 Feb, 2017 @ 9:38am

Piñata Party

Find and break every web cache in Episode Two.
Unlocked 3 Feb, 2017 @ 8:57am

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 10 Jul, 2013 @ 3:22am

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 10 Jul, 2013 @ 7:24am

Hit and Run

Run over 20 enemies with the car in Episode Two.
Unlocked 5 Feb, 2017 @ 6:07am

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 10 Jul, 2013 @ 8:06am

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.
Unlocked 5 Feb, 2017 @ 5:50am

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 10 Jul, 2013 @ 8:34am

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 10 Jul, 2013 @ 9:04am

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked 11 Jul, 2013 @ 3:09am

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 10 Jul, 2013 @ 8:42am

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 10 Jul, 2013 @ 8:58am

Little Rocket Man

Send the garden gnome into space.
Unlocked 7 Feb, 2017 @ 7:45am

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 11 Jul, 2013 @ 3:32am

Neighborhood Watch

Save all buildings outside the missile silo from destruction.
Unlocked 12 Jun, 2015 @ 5:37am

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 11 Jul, 2013 @ 9:52am

Payback

Kill a Hunter with its own flechettes.
Unlocked 11 Jul, 2013 @ 7:48am

Bone Breaker

Kill 30 enemies with thrown physics objects.
Unlocked 6 Jun, 2015 @ 6:40am

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 10 Jul, 2013 @ 3:13am

Hot Potat0wned

Kill a Combine soldier with his own grenade.
Unlocked 7 Feb, 2017 @ 7:04am

Grave Robber

Steal a Zombine's grenade.
Unlocked 5 Jun, 2015 @ 6:13am

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 Nov, 2020 @ 12:39pm