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

Acid Reflex

Kill an acid antlion worker.
Unlocked 6 Feb, 2018 @ 2:45am

Get Some Grub

Squish every antlion grub in Episode Two.
Unlocked 16 Jan, 2021 @ 6:23am

Piñata Party

Find and break every web cache in Episode Two.
Unlocked 16 Jan, 2021 @ 6:23am

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 7 Feb, 2018 @ 12:07am

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 7 Feb, 2018 @ 1:31am

Hit and Run

Run over 20 enemies with the car in Episode Two.
Unlocked 7 Feb, 2018 @ 7:02pm

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 7 Feb, 2018 @ 3:52am

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.
Unlocked 7 Feb, 2018 @ 4:23pm

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 7 Feb, 2018 @ 4:41pm

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 7 Feb, 2018 @ 5:31pm

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked 7 Feb, 2018 @ 5:38pm

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 7 Feb, 2018 @ 4:52pm

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 7 Feb, 2018 @ 5:25pm

Little Rocket Man

Send the garden gnome into space.
Unlocked 7 Feb, 2018 @ 7:42pm

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 7 Feb, 2018 @ 6:08pm

Neighborhood Watch

Save all buildings outside the missile silo from destruction.
Unlocked 16 Jan, 2021 @ 6:25am

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 7 Feb, 2018 @ 7:23pm

Payback

Kill a Hunter with its own flechettes.
Unlocked 7 Feb, 2018 @ 3:51am

Bone Breaker

Kill 30 enemies with thrown physics objects.
Unlocked 7 Feb, 2018 @ 4:55pm

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 6 Feb, 2018 @ 11:55pm

Hot Potat0wned

Kill a Combine soldier with his own grenade.
Unlocked 16 Jan, 2021 @ 6:24am

Grave Robber

Steal a Zombine's grenade.
Unlocked 7 Feb, 2018 @ 12:45am

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 16 Jan, 2021 @ 6:22am