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20 of 23 (87%) achievements earned:
Personal Achievements
 

Acid Reflex

Kill an acid antlion worker.
Unlocked 20 Jan, 2017 @ 9:07am

Piñata Party

Find and break every web cache in Episode Two.
Unlocked 24 Nov, 2021 @ 6:19am

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 20 Jan, 2017 @ 9:26am

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 26 Jan, 2017 @ 9:34am

Hit and Run

Run over 20 enemies with the car in Episode Two.
Unlocked 21 Oct, 2021 @ 3:22pm

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 1 Feb, 2017 @ 1:43am

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.
Unlocked 24 Sep, 2020 @ 7:10am

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 1 Feb, 2017 @ 2:06am

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 24 Sep, 2020 @ 7:38am

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked 22 Jun, 2017 @ 4:25am

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 1 Feb, 2017 @ 2:09am

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 22 Jun, 2017 @ 4:15am

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 22 Jun, 2017 @ 4:44am

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 24 Sep, 2020 @ 8:42am

Payback

Kill a Hunter with its own flechettes.
Unlocked 24 Sep, 2020 @ 7:33am

Bone Breaker

Kill 30 enemies with thrown physics objects.
Unlocked 22 Jun, 2017 @ 4:38am

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 2 Aug, 2017 @ 3:47am

Hot Potat0wned

Kill a Combine soldier with his own grenade.
Unlocked 21 Oct, 2021 @ 2:19pm

Grave Robber

Steal a Zombine's grenade.
Unlocked 20 Jan, 2017 @ 8:55am

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 12 Oct, 2021 @ 9:15am



Get Some Grub

Squish every antlion grub in Episode Two.

Little Rocket Man

Send the garden gnome into space.

Neighborhood Watch

Save all buildings outside the missile silo from destruction.