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23 of 23 (100%) achievements earned:

Personal Achievements
 

Acid Reflex

Kill an acid antlion worker.
Unlocked May 6, 2020 @ 1:18am

Get Some Grub

Squish every antlion grub in Episode Two.
Unlocked May 6, 2020 @ 5:05am

Piñata Party

Find and break every web cache in Episode Two.
Unlocked May 6, 2020 @ 4:53am

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked May 6, 2020 @ 2:09am

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked May 7, 2020 @ 5:16am

Hit and Run

Run over 20 enemies with the car in Episode Two.
Unlocked May 7, 2020 @ 7:49am

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked May 7, 2020 @ 6:51am

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.
Unlocked May 7, 2020 @ 7:31am

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked May 7, 2020 @ 7:44am

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked May 7, 2020 @ 8:17am

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked May 7, 2020 @ 8:24am

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked May 7, 2020 @ 7:54am

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked May 7, 2020 @ 8:12am

Little Rocket Man

Send the garden gnome into space.
Unlocked May 7, 2020 @ 8:32am

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked May 7, 2020 @ 8:44am

Neighborhood Watch

Save all buildings outside the missile silo from destruction.
Unlocked May 7, 2020 @ 9:28am

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked May 7, 2020 @ 9:28am

Payback

Kill a Hunter with its own flechettes.
Unlocked May 7, 2020 @ 6:50am

Bone Breaker

Kill 30 enemies with thrown physics objects.
Unlocked May 7, 2020 @ 7:35am

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked May 6, 2020 @ 1:57am

Hot Potat0wned

Kill a Combine soldier with his own grenade.
Unlocked May 7, 2020 @ 7:08am

Grave Robber

Steal a Zombine's grenade.
Unlocked May 6, 2020 @ 4:10am

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 Nov 20, 2020 @ 1:01am