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

Acid Reflex

Kill an acid antlion worker.
Unlocked 30 Sep, 2014 @ 5:00pm

Get Some Grub

Squish every antlion grub in Episode Two.
Unlocked 17 Feb, 2022 @ 3:56pm

Piñata Party

Find and break every web cache in Episode Two.
Unlocked 12 Feb, 2022 @ 9:31pm

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 30 Sep, 2014 @ 5:22pm

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 14 Feb, 2021 @ 11:59am

Hit and Run

Run over 20 enemies with the car in Episode Two.
Unlocked 13 Feb, 2022 @ 11:38am

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 14 Feb, 2021 @ 12:45pm

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.
Unlocked 13 Feb, 2022 @ 11:18am

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 14 Feb, 2021 @ 1:05pm

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 13 Feb, 2022 @ 12:02pm

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked 14 Feb, 2021 @ 2:20pm

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 14 Feb, 2021 @ 1:10pm

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 14 Feb, 2021 @ 1:22pm

Little Rocket Man

Send the garden gnome into space.
Unlocked 13 Feb, 2022 @ 12:14pm

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 3 Oct, 2014 @ 6:11pm

Neighborhood Watch

Save all buildings outside the missile silo from destruction.
Unlocked 17 Feb, 2022 @ 6:40pm

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 17 Feb, 2022 @ 6:40pm

Payback

Kill a Hunter with its own flechettes.
Unlocked 13 Feb, 2022 @ 8:37am

Bone Breaker

Kill 30 enemies with thrown physics objects.
Unlocked 12 Feb, 2022 @ 9:49pm

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 30 Sep, 2014 @ 5:16pm

Hot Potat0wned

Kill a Combine soldier with his own grenade.
Unlocked 17 Feb, 2022 @ 7:03pm

Grave Robber

Steal a Zombine's grenade.
Unlocked 12 Feb, 2022 @ 9:09pm

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 14 Feb, 2021 @ 9:14am