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14 of 23 (61%) achievements earned:
Personal Achievements
 

Acid Reflex

Kill an acid antlion worker.
Unlocked 29 Nov, 2015 @ 3:27am

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 29 Nov, 2015 @ 3:52am

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 6 Mar, 2019 @ 10:56am

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 6 Mar, 2019 @ 11:35am

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 6 Mar, 2019 @ 12:04pm

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 31 Mar, 2020 @ 2:20am

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked 7 Mar, 2019 @ 8:59am

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 30 Mar, 2020 @ 11:02am

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 6 Mar, 2019 @ 12:15pm

Little Rocket Man

Send the garden gnome into space.
Unlocked 31 Mar, 2020 @ 2:34am

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 7 Jul, 2019 @ 5:13am

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 6 Mar, 2019 @ 9:51am

Grave Robber

Steal a Zombine's grenade.
Unlocked 30 Mar, 2020 @ 7:10am

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 18 Nov @ 3:33am



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.

Neighborhood Watch

Save all buildings outside the missile silo from destruction.

Defense of the Armament

Save the missile silo from the Combine offensive.

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.