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

Acid Reflex

Kill an acid antlion worker.
Unlocked 26 Dec, 2014 @ 7:46am

Get Some Grub

Squish every antlion grub in Episode Two.
Unlocked 25 Mar, 2020 @ 4:07am

Piñata Party

Find and break every web cache in Episode Two.
Unlocked 26 Dec, 2014 @ 9:09am

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 26 Dec, 2014 @ 8:25am

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 26 Dec, 2014 @ 9:27am

Hit and Run

Run over 20 enemies with the car in Episode Two.
Unlocked 27 Dec, 2014 @ 12:12pm

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 27 Dec, 2014 @ 11:01am

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.
Unlocked 23 Mar, 2020 @ 7:30pm

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 27 Dec, 2014 @ 11:54am

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 27 Dec, 2014 @ 12:38pm

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked 27 Dec, 2014 @ 12:45pm

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 27 Dec, 2014 @ 12:13pm

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 27 Dec, 2014 @ 12:31pm

Little Rocket Man

Send the garden gnome into space.
Unlocked 27 Dec, 2014 @ 12:55pm

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 27 Dec, 2014 @ 1:11pm

Neighborhood Watch

Save all buildings outside the missile silo from destruction.
Unlocked 24 Mar, 2020 @ 6:39pm

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 24 Mar, 2020 @ 6:39pm

Payback

Kill a Hunter with its own flechettes.
Unlocked 23 Mar, 2020 @ 7:15pm

Bone Breaker

Kill 30 enemies with thrown physics objects.
Unlocked 27 Dec, 2014 @ 11:38am

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 25 Mar, 2020 @ 3:05am

Hot Potat0wned

Kill a Combine soldier with his own grenade.
Unlocked 27 Dec, 2014 @ 11:44am

Grave Robber

Steal a Zombine's grenade.
Unlocked 27 Dec, 2014 @ 10:56am

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 @ 4:32pm