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

Acid Reflex

Kill an acid antlion worker.
Unlocked 30 Dec, 2012 @ 8:40am

Get Some Grub

Squish every antlion grub in Episode Two.
Unlocked 17 Feb, 2018 @ 2:44pm

Piñata Party

Find and break every web cache in Episode Two.
Unlocked 17 Feb, 2018 @ 2:34pm

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 2 Oct, 2013 @ 5:17am

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 3 Oct, 2013 @ 4:17am

Hit and Run

Run over 20 enemies with the car in Episode Two.
Unlocked 17 Feb, 2018 @ 12:12pm

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 3 Oct, 2013 @ 5:43am

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.
Unlocked 17 Feb, 2018 @ 1:16pm

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 3 Oct, 2013 @ 6:05am

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 3 Oct, 2013 @ 6:26am

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked 3 Oct, 2013 @ 6:31am

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 3 Oct, 2013 @ 6:08am

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 3 Oct, 2013 @ 6:22am

Little Rocket Man

Send the garden gnome into space.
Unlocked 17 Feb, 2018 @ 11:31am

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 3 Oct, 2013 @ 6:52am

Neighborhood Watch

Save all buildings outside the missile silo from destruction.
Unlocked 17 Feb, 2018 @ 12:18pm

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 7 May, 2016 @ 7:49am

Payback

Kill a Hunter with its own flechettes.
Unlocked 17 Feb, 2018 @ 1:03pm

Bone Breaker

Kill 30 enemies with thrown physics objects.
Unlocked 17 Feb, 2018 @ 12:54pm

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 2 Oct, 2013 @ 5:10am

Hot Potat0wned

Kill a Combine soldier with his own grenade.
Unlocked 17 Feb, 2018 @ 1:41pm

Grave Robber

Steal a Zombine's grenade.
Unlocked 30 Dec, 2012 @ 5:02am

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 28 Dec, 2020 @ 12:00pm