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

Acid Reflex

Kill an acid antlion worker.
Unlocked 11 Jul, 2011 @ 7:05pm

Get Some Grub

Squish every antlion grub in Episode Two.
Unlocked 11 Sep, 2015 @ 9:53pm

Piñata Party

Find and break every web cache in Episode Two.
Unlocked 5 Oct, 2011 @ 1:32am

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 11 Jul, 2011 @ 7:08pm

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 11 Jul, 2011 @ 8:17pm

Hit and Run

Run over 20 enemies with the car in Episode Two.
Unlocked 7 Oct, 2011 @ 7:11pm

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 11 Jul, 2011 @ 9:18pm

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.
Unlocked 11 Jul, 2011 @ 9:52pm

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 11 Jul, 2011 @ 10:14pm

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 11 Jul, 2011 @ 10:56pm

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked 11 Jul, 2011 @ 11:04pm

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 11 Jul, 2011 @ 10:20pm

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 11 Jul, 2011 @ 10:47pm

Little Rocket Man

Send the garden gnome into space.
Unlocked 11 Jul, 2011 @ 11:14pm

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 12 Jul, 2011 @ 12:05am

Neighborhood Watch

Save all buildings outside the missile silo from destruction.
Unlocked 7 Oct, 2011 @ 7:25pm

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 12 Jul, 2011 @ 3:59pm

Payback

Kill a Hunter with its own flechettes.
Unlocked 11 Sep, 2015 @ 10:46pm

Bone Breaker

Kill 30 enemies with thrown physics objects.
Unlocked 11 Sep, 2015 @ 8:26pm

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 11 Jul, 2011 @ 7:07pm

Hot Potat0wned

Kill a Combine soldier with his own grenade.
Unlocked 18 Feb, 2022 @ 7:02pm

Grave Robber

Steal a Zombine's grenade.
Unlocked 11 Jul, 2011 @ 7:24pm

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 @ 2:39pm