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

Acid Reflex

Kill an acid antlion worker.
Unlocked 29 Apr, 2013 @ 5:51am

Get Some Grub

Squish every antlion grub in Episode Two.
Unlocked 14 Dec, 2019 @ 6:49am

Piñata Party

Find and break every web cache in Episode Two.
Unlocked 11 Dec, 2019 @ 7:20am

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 29 Apr, 2013 @ 6:14am

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 30 Apr, 2013 @ 7:21am

Hit and Run

Run over 20 enemies with the car in Episode Two.
Unlocked 13 Dec, 2019 @ 2:27pm

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 1 May, 2013 @ 5:08am

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.
Unlocked 13 Dec, 2019 @ 4:15pm

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 1 May, 2013 @ 5:35am

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 13 Dec, 2019 @ 2:51pm

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked 13 Dec, 2019 @ 2:57pm

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 1 May, 2013 @ 5:41am

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 1 May, 2013 @ 5:54am

Little Rocket Man

Send the garden gnome into space.
Unlocked 13 Dec, 2019 @ 3:04pm

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 6 May, 2013 @ 5:16am

Neighborhood Watch

Save all buildings outside the missile silo from destruction.
Unlocked 14 Dec, 2019 @ 8:12am

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 6 May, 2013 @ 5:54am

Payback

Kill a Hunter with its own flechettes.
Unlocked 13 Dec, 2019 @ 1:31pm

Bone Breaker

Kill 30 enemies with thrown physics objects.
Unlocked 11 Dec, 2019 @ 7:59am

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 29 Apr, 2013 @ 6:05am

Hot Potat0wned

Kill a Combine soldier with his own grenade.
Unlocked 13 Dec, 2019 @ 1:46pm

Grave Robber

Steal a Zombine's grenade.
Unlocked 1 May, 2013 @ 4:50am

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 20 Nov, 2020 @ 11:34pm