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18 of 23 (78%) achievements earned:
Personal Achievements
 

Acid Reflex

Kill an acid antlion worker.
Unlocked 21 Dec, 2016 @ 4:44am

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 21 Dec, 2016 @ 5:04am

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 21 Dec, 2016 @ 5:57am

Hit and Run

Run over 20 enemies with the car in Episode Two.
Unlocked 21 Dec, 2016 @ 10:44am

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 21 Dec, 2016 @ 6:42am

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.
Unlocked 19 Dec, 2019 @ 1:55pm

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 21 Dec, 2016 @ 7:16am

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 10 Nov, 2020 @ 9:56am

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked 21 Dec, 2016 @ 7:41am

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 21 Dec, 2016 @ 7:20am

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 21 Dec, 2016 @ 7:31am

Little Rocket Man

Send the garden gnome into space.
Unlocked 19 Dec, 2019 @ 2:17pm

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 21 Dec, 2016 @ 10:20am

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 21 Dec, 2016 @ 10:49am

Bone Breaker

Kill 30 enemies with thrown physics objects.
Unlocked 21 Dec, 2016 @ 10:16am

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 21 Dec, 2016 @ 4:59am

Grave Robber

Steal a Zombine's grenade.
Unlocked 21 Dec, 2016 @ 6:14am

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 21 Nov, 2020 @ 2:21pm



Get Some Grub

Squish every antlion grub in Episode Two.

Piñata Party

Find and break every web cache in Episode Two.

Neighborhood Watch

Save all buildings outside the missile silo from destruction.

Payback

Kill a Hunter with its own flechettes.

Hot Potat0wned

Kill a Combine soldier with his own grenade.