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

Acid Reflex

Kill an acid antlion worker.
Unlocked 2 Aug, 2015 @ 4:46am

Get Some Grub

Squish every antlion grub in Episode Two.
Unlocked 2 Jun, 2019 @ 11:06am

Piñata Party

Find and break every web cache in Episode Two.
Unlocked 16 Apr, 2016 @ 7:03am

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 2 Aug, 2015 @ 5:05am

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 2 Aug, 2015 @ 5:55am

Hit and Run

Run over 20 enemies with the car in Episode Two.
Unlocked 2 Jun, 2019 @ 4:52pm

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 2 Aug, 2015 @ 6:33am

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.
Unlocked 2 Jun, 2019 @ 4:38pm

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 2 Aug, 2015 @ 7:03am

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 2 Jun, 2019 @ 5:09pm

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked 2 Jun, 2019 @ 5:13pm

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 2 Aug, 2015 @ 7:11am

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 25 Sep, 2017 @ 3:20pm

Little Rocket Man

Send the garden gnome into space.
Unlocked 25 Sep, 2017 @ 3:35pm

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 2 Jun, 2019 @ 5:35pm

Neighborhood Watch

Save all buildings outside the missile silo from destruction.
Unlocked 2 Jun, 2019 @ 6:14pm

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 2 Jun, 2019 @ 6:14pm

Payback

Kill a Hunter with its own flechettes.
Unlocked 2 Jun, 2019 @ 5:02pm

Bone Breaker

Kill 30 enemies with thrown physics objects.
Unlocked 2 Jun, 2019 @ 9:42am

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 2 Aug, 2015 @ 4:58am

Hot Potat0wned

Kill a Combine soldier with his own grenade.
Unlocked 2 Jun, 2019 @ 5:05pm

Grave Robber

Steal a Zombine's grenade.
Unlocked 25 Sep, 2017 @ 2:40pm

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 21 Nov, 2020 @ 2:21pm