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

Acid Reflex

Kill an acid antlion worker.
Unlocked Dec 26, 2019 @ 3:17pm

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked Nov 8, 2020 @ 8:54am

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked Aug 1, 2019 @ 6:28pm

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked Aug 4, 2019 @ 1:16pm

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.
Unlocked Aug 4, 2019 @ 1:31pm

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked Aug 4, 2019 @ 1:36pm

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked Mar 30, 2021 @ 8:12pm

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked Nov 8, 2020 @ 3:14pm

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked Aug 4, 2019 @ 1:44pm

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked Aug 4, 2019 @ 2:05pm

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked Aug 4, 2019 @ 10:30pm

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked Nov 8, 2020 @ 8:48am

Grave Robber

Steal a Zombine's grenade.
Unlocked Mar 20, 2021 @ 7:34pm

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 Mar 18, 2021 @ 7:19am



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.

Cache Checker

Find every radar cache in chapter Under The Radar.

Little Rocket Man

Send the garden gnome into space.

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.