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

Acid Reflex

Kill an acid antlion worker.
Unlocked 29 Aug, 2013 @ 9:03am

Get Some Grub

Squish every antlion grub in Episode Two.
Unlocked 10 Jul, 2019 @ 12:10pm

Piñata Party

Find and break every web cache in Episode Two.
Unlocked 10 Jul, 2019 @ 10:00am

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 29 Aug, 2013 @ 2:03pm

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 29 Aug, 2013 @ 4:28pm

Hit and Run

Run over 20 enemies with the car in Episode Two.
Unlocked 29 Aug, 2013 @ 8:06pm

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 29 Aug, 2013 @ 6:05pm

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.
Unlocked 10 Jul, 2019 @ 6:27pm

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 29 Aug, 2013 @ 6:38pm

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 29 Aug, 2013 @ 7:13pm

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked 29 Aug, 2013 @ 7:19pm

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 29 Aug, 2013 @ 6:45pm

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 29 Aug, 2013 @ 7:05pm

Little Rocket Man

Send the garden gnome into space.
Unlocked 10 Jul, 2019 @ 7:31pm

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 29 Aug, 2013 @ 7:41pm

Neighborhood Watch

Save all buildings outside the missile silo from destruction.
Unlocked 11 Jul, 2019 @ 9:42pm

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 29 Aug, 2013 @ 8:12pm

Payback

Kill a Hunter with its own flechettes.
Unlocked 26 Aug, 2014 @ 12:03pm

Bone Breaker

Kill 30 enemies with thrown physics objects.
Unlocked 9 Jul, 2019 @ 11:50am

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 29 Aug, 2013 @ 9:26am

Hot Potat0wned

Kill a Combine soldier with his own grenade.
Unlocked 10 Jul, 2019 @ 6:38pm

Grave Robber

Steal a Zombine's grenade.
Unlocked 26 Aug, 2014 @ 12:22pm

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 1 Jan, 2023 @ 6:59am