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

Acid Reflex

Kill an acid antlion worker.
Unlocked 16 Apr, 2011 @ 2:58am

Get Some Grub

Squish every antlion grub in Episode Two.
Unlocked 22 Jan, 2019 @ 8:55am

Piñata Party

Find and break every web cache in Episode Two.
Unlocked 15 Nov, 2018 @ 6:54pm

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 16 Apr, 2011 @ 3:18am

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 16 Apr, 2011 @ 6:46pm

Hit and Run

Run over 20 enemies with the car in Episode Two.
Unlocked 10 Sep, 2011 @ 3:04am

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 29 May, 2011 @ 6:11am

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.
Unlocked 15 Nov, 2018 @ 8:21pm

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 29 May, 2011 @ 6:38am

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 11 Apr, 2014 @ 11:15pm

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked 30 May, 2011 @ 5:30am

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 11 Apr, 2014 @ 10:54pm

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 30 May, 2011 @ 5:22am

Little Rocket Man

Send the garden gnome into space.
Unlocked 15 Nov, 2018 @ 8:52pm

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 10 Sep, 2011 @ 2:40am

Neighborhood Watch

Save all buildings outside the missile silo from destruction.
Unlocked 14 Jul, 2015 @ 3:10am

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 7 Jul, 2015 @ 3:04am

Payback

Kill a Hunter with its own flechettes.
Unlocked 7 Jul, 2015 @ 2:46am

Bone Breaker

Kill 30 enemies with thrown physics objects.
Unlocked 11 Apr, 2014 @ 9:51pm

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 16 Apr, 2011 @ 3:10am

Hot Potat0wned

Kill a Combine soldier with his own grenade.
Unlocked 22 Jan, 2019 @ 8:16pm

Grave Robber

Steal a Zombine's grenade.
Unlocked 13 Jul, 2015 @ 5:29am

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 Apr, 2022 @ 4:02am