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

Acid Reflex

Kill an acid antlion worker.
Unlocked 27 Mar, 2020 @ 2:40am

Get Some Grub

Squish every antlion grub in Episode Two.
Unlocked 12 Oct @ 8:37am

Piñata Party

Find and break every web cache in Episode Two.
Unlocked 12 Oct @ 8:26am

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 27 Mar, 2020 @ 3:06am

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 27 Mar, 2020 @ 3:58am

Hit and Run

Run over 20 enemies with the car in Episode Two.
Unlocked 27 Mar, 2020 @ 6:34am

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 27 Mar, 2020 @ 4:49am

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.
Unlocked 12 Oct @ 12:01pm

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 27 Mar, 2020 @ 5:11am

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 27 Mar, 2020 @ 5:35am

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked 13 Oct @ 1:03am

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 27 Mar, 2020 @ 5:16am

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 27 Mar, 2020 @ 5:30am

Little Rocket Man

Send the garden gnome into space.
Unlocked 13 Oct @ 1:09am

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 27 Mar, 2020 @ 5:58am

Neighborhood Watch

Save all buildings outside the missile silo from destruction.
Unlocked 13 Oct @ 2:22am

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 27 Mar, 2020 @ 6:34am

Payback

Kill a Hunter with its own flechettes.
Unlocked 12 Oct @ 11:41am

Bone Breaker

Kill 30 enemies with thrown physics objects.
Unlocked 27 Mar, 2020 @ 5:54am

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 27 Mar, 2020 @ 2:57am

Hot Potat0wned

Kill a Combine soldier with his own grenade.
Unlocked 12 Oct @ 11:51am

Grave Robber

Steal a Zombine's grenade.
Unlocked 12 Oct @ 6:19am

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 12 Oct @ 6:04am