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13 of 23 (57%) achievements earned:
Personal Achievements
 

Acid Reflex

Kill an acid antlion worker.
Unlocked 24 Nov, 2017 @ 2:32am

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 25 Nov, 2017 @ 1:16am

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 26 Nov, 2017 @ 5:01am

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 17 Dec, 2018 @ 9:56am

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 26 Nov, 2017 @ 8:00am

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 26 Nov, 2017 @ 10:58am

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 26 Nov, 2017 @ 8:06am

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 26 Nov, 2017 @ 10:48am

Little Rocket Man

Send the garden gnome into space.
Unlocked 23 Dec, 2018 @ 6:18am

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 26 Nov, 2017 @ 12:02pm

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 26 Nov, 2017 @ 12:58pm

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 25 Nov, 2017 @ 1:04am

Grave Robber

Steal a Zombine's grenade.
Unlocked 14 Dec, 2018 @ 11:37am



Get Some Grub

Squish every antlion grub in Episode Two.

Piñata Party

Find and break every web cache in Episode Two.

Hit and Run

Run over 20 enemies with the car in Episode Two.

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.

Pedal to the Metal

Beat DOG in a race to the White Forest base.

Neighborhood Watch

Save all buildings outside the missile silo from destruction.

Payback

Kill a Hunter with its own flechettes.

Bone Breaker

Kill 30 enemies with thrown physics objects.

Hot Potat0wned

Kill a Combine soldier with his own grenade.

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.