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21 of 23 (91%) achievements earned:
Personal Achievements
 

Acid Reflex

Kill an acid antlion worker.
Unlocked 20 Jul, 2013 @ 6:27am

Piñata Party

Find and break every web cache in Episode Two.
Unlocked 20 Jul, 2013 @ 7:38am

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 20 Jul, 2013 @ 6:55am

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 20 Jul, 2013 @ 7:54am

Hit and Run

Run over 20 enemies with the car in Episode Two.
Unlocked 24 Jul, 2013 @ 8:33am

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 24 Jul, 2013 @ 7:58am

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.
Unlocked 24 Jul, 2013 @ 8:15am

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 24 Jul, 2013 @ 8:28am

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 24 Jul, 2013 @ 8:50am

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked 24 Jul, 2013 @ 8:55am

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 24 Jul, 2013 @ 8:33am

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 24 Jul, 2013 @ 8:47am

Little Rocket Man

Send the garden gnome into space.
Unlocked 31 Aug, 2016 @ 3:48pm

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 24 Jul, 2013 @ 9:13am

Neighborhood Watch

Save all buildings outside the missile silo from destruction.
Unlocked 1 Sep, 2016 @ 11:43am

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 1 Sep, 2016 @ 11:43am

Payback

Kill a Hunter with its own flechettes.
Unlocked 24 Jul, 2013 @ 7:57am

Bone Breaker

Kill 30 enemies with thrown physics objects.
Unlocked 20 Jul, 2013 @ 8:10am

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 20 Jul, 2013 @ 6:41am

Grave Robber

Steal a Zombine's grenade.
Unlocked 20 Jul, 2013 @ 7:08am

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 @ 5:35pm



Get Some Grub

Squish every antlion grub in Episode Two.

Hot Potat0wned

Kill a Combine soldier with his own grenade.