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

Acid Reflex

Kill an acid antlion worker.
Unlocked 6 Oct, 2017 @ 2:12pm

Get Some Grub

Squish every antlion grub in Episode Two.
Unlocked 4 Nov, 2017 @ 8:23am

Piñata Party

Find and break every web cache in Episode Two.
Unlocked 4 Nov, 2017 @ 2:31am

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 8 Oct, 2017 @ 1:15am

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 9 Oct, 2017 @ 5:54am

Hit and Run

Run over 20 enemies with the car in Episode Two.
Unlocked 10 Oct, 2017 @ 7:10am

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 10 Oct, 2017 @ 4:33am

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.
Unlocked 5 Nov, 2017 @ 2:26am

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 10 Oct, 2017 @ 5:25am

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 5 Nov, 2017 @ 2:02am

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked 10 Oct, 2017 @ 6:02am

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 10 Oct, 2017 @ 5:32am

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 10 Oct, 2017 @ 5:51am

Little Rocket Man

Send the garden gnome into space.
Unlocked 5 Nov, 2017 @ 3:53am

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 10 Oct, 2017 @ 6:38am

Neighborhood Watch

Save all buildings outside the missile silo from destruction.
Unlocked 5 Nov, 2017 @ 5:14am

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 10 Oct, 2017 @ 7:45am

Payback

Kill a Hunter with its own flechettes.
Unlocked 10 Oct, 2017 @ 6:33am

Bone Breaker

Kill 30 enemies with thrown physics objects.
Unlocked 4 Nov, 2017 @ 3:42am

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 8 Oct, 2017 @ 1:02am

Hot Potat0wned

Kill a Combine soldier with his own grenade.
Unlocked 5 Nov, 2017 @ 5:23am

Grave Robber

Steal a Zombine's grenade.
Unlocked 9 Oct, 2017 @ 6:14am

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 9 Jan, 2022 @ 10:13am