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23 of 23 (100%) achievements earned:
Personal Achievements
 

Acid Reflex

Kill an acid antlion worker.
Unlocked 13 Jun, 2014 @ 8:22pm

Get Some Grub

Squish every antlion grub in Episode Two.
Unlocked 10 Jan, 2020 @ 4:00pm

Piñata Party

Find and break every web cache in Episode Two.
Unlocked 10 Jan, 2020 @ 4:53pm

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 29 Mar, 2017 @ 1:25pm

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 13 Jun, 2014 @ 8:42pm

Hit and Run

Run over 20 enemies with the car in Episode Two.
Unlocked 29 Mar, 2017 @ 5:04pm

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 29 Mar, 2017 @ 3:37pm

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.
Unlocked 10 Jan, 2020 @ 6:21pm

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 29 Mar, 2017 @ 3:56pm

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 29 Mar, 2017 @ 4:17pm

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked 29 Mar, 2017 @ 4:22pm

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 29 Mar, 2017 @ 4:02pm

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 29 Mar, 2017 @ 4:13pm

Little Rocket Man

Send the garden gnome into space.
Unlocked 10 Jan, 2020 @ 7:13pm

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 29 Mar, 2017 @ 4:39pm

Neighborhood Watch

Save all buildings outside the missile silo from destruction.
Unlocked 10 Jan, 2020 @ 8:03pm

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 29 Mar, 2017 @ 5:08pm

Payback

Kill a Hunter with its own flechettes.
Unlocked 10 Jan, 2020 @ 6:02pm

Bone Breaker

Kill 30 enemies with thrown physics objects.
Unlocked 10 Jan, 2020 @ 4:41pm

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 29 Mar, 2017 @ 1:24pm

Hot Potat0wned

Kill a Combine soldier with his own grenade.
Unlocked 10 Jan, 2020 @ 6:28pm

Grave Robber

Steal a Zombine's grenade.
Unlocked 29 Mar, 2017 @ 3:20pm

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 27 Oct, 2023 @ 10:00pm