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

Acid Reflex

Kill an acid antlion worker.
Unlocked 1 Feb, 2015 @ 9:22pm

Get Some Grub

Squish every antlion grub in Episode Two.
Unlocked 19 Nov, 2019 @ 12:01am

Piñata Party

Find and break every web cache in Episode Two.
Unlocked 1 Feb, 2015 @ 10:47pm

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 1 Feb, 2015 @ 9:52pm

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 1 Feb, 2015 @ 11:05pm

Hit and Run

Run over 20 enemies with the car in Episode Two.
Unlocked 3 Feb, 2015 @ 1:23pm

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 3 Feb, 2015 @ 12:47pm

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.
Unlocked 3 Feb, 2015 @ 1:07pm

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 3 Feb, 2015 @ 1:17pm

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 3 Feb, 2015 @ 1:47pm

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked 3 Feb, 2015 @ 1:54pm

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 3 Feb, 2015 @ 1:24pm

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 3 Feb, 2015 @ 1:38pm

Little Rocket Man

Send the garden gnome into space.
Unlocked 19 Nov, 2019 @ 12:57am

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 3 Feb, 2015 @ 2:12pm

Neighborhood Watch

Save all buildings outside the missile silo from destruction.
Unlocked 4 Feb, 2015 @ 2:45pm

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 4 Feb, 2015 @ 2:45pm

Payback

Kill a Hunter with its own flechettes.
Unlocked 3 Feb, 2015 @ 12:46pm

Bone Breaker

Kill 30 enemies with thrown physics objects.
Unlocked 18 Nov, 2019 @ 11:39pm

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 1 Feb, 2015 @ 9:42pm

Hot Potat0wned

Kill a Combine soldier with his own grenade.
Unlocked 18 Nov, 2019 @ 11:20pm

Grave Robber

Steal a Zombine's grenade.
Unlocked 1 Feb, 2015 @ 10:04pm

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 15 Mar, 2021 @ 4:37pm