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

Acid Reflex

Kill an acid antlion worker.
Unlocked 28 Oct, 2023 @ 2:40am

Get Some Grub

Squish every antlion grub in Episode Two.
Unlocked 29 Oct, 2023 @ 7:28am

Piñata Party

Find and break every web cache in Episode Two.
Unlocked 28 Oct, 2023 @ 8:10am

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 28 Oct, 2023 @ 6:52am

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 28 Oct, 2023 @ 12:27pm

Hit and Run

Run over 20 enemies with the car in Episode Two.
Unlocked 29 Oct, 2023 @ 1:59am

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 28 Oct, 2023 @ 1:27pm

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.
Unlocked 28 Oct, 2023 @ 2:36pm

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 29 Oct, 2023 @ 1:54am

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 29 Oct, 2023 @ 2:34am

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked 29 Oct, 2023 @ 2:42am

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 29 Oct, 2023 @ 2:01am

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 29 Oct, 2023 @ 2:28am

Little Rocket Man

Send the garden gnome into space.
Unlocked 29 Oct, 2023 @ 2:49am

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 29 Oct, 2023 @ 3:04am

Neighborhood Watch

Save all buildings outside the missile silo from destruction.
Unlocked 29 Oct, 2023 @ 3:54am

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 29 Oct, 2023 @ 3:54am

Payback

Kill a Hunter with its own flechettes.
Unlocked 28 Oct, 2023 @ 1:25pm

Bone Breaker

Kill 30 enemies with thrown physics objects.
Unlocked 28 Oct, 2023 @ 7:50am

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 28 Oct, 2023 @ 4:24am

Hot Potat0wned

Kill a Combine soldier with his own grenade.
Unlocked 29 Oct, 2023 @ 1:44am

Grave Robber

Steal a Zombine's grenade.
Unlocked 28 Oct, 2023 @ 2:24am

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 28 Oct, 2023 @ 2:14am