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

Acid Reflex

Kill an acid antlion worker.
Unlocked 19 Sep, 2023 @ 10:56am

Get Some Grub

Squish every antlion grub in Episode Two.
Unlocked 10 Feb @ 3:05pm

Piñata Party

Find and break every web cache in Episode Two.
Unlocked 10 Feb @ 2:53pm

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 19 Sep, 2023 @ 11:17am

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 19 Sep, 2023 @ 1:18pm

Hit and Run

Run over 20 enemies with the car in Episode Two.
Unlocked 10 Feb @ 11:49pm

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 19 Sep, 2023 @ 2:21pm

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.
Unlocked 30 Mar @ 9:36am

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 19 Sep, 2023 @ 2:56pm

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 19 Sep, 2023 @ 3:58pm

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked 11 Feb @ 8:04pm

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 19 Sep, 2023 @ 3:16pm

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 19 Sep, 2023 @ 3:50pm

Little Rocket Man

Send the garden gnome into space.
Unlocked 30 Mar @ 12:46pm

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 19 Sep, 2023 @ 4:31pm

Neighborhood Watch

Save all buildings outside the missile silo from destruction.
Unlocked 31 Mar @ 11:12am

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 20 Sep, 2023 @ 11:24am

Payback

Kill a Hunter with its own flechettes.
Unlocked 10 Feb @ 11:13pm

Bone Breaker

Kill 30 enemies with thrown physics objects.
Unlocked 10 Feb @ 2:25pm

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 19 Sep, 2023 @ 11:04am

Hot Potat0wned

Kill a Combine soldier with his own grenade.
Unlocked 10 Feb @ 11:26pm

Grave Robber

Steal a Zombine's grenade.
Unlocked 10 Feb @ 12:45pm

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 19 Sep, 2023 @ 10:30am