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12 of 22 (55%) achievements earned:

Personal Achievements
 
Unlocked Apr 1, 2016 @ 10:51pm

Acid Reflex

Kill an acid antlion worker.
Unlocked Apr 1, 2016 @ 11:08pm

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked Apr 1, 2016 @ 11:56pm

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked Apr 2, 2016 @ 6:05pm

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked Apr 2, 2016 @ 6:34pm

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked Apr 2, 2016 @ 7:12pm

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked Apr 2, 2016 @ 7:19pm

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked Apr 2, 2016 @ 6:39pm

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked Apr 2, 2016 @ 7:02pm

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked Apr 2, 2016 @ 7:36pm

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked Apr 2, 2016 @ 8:13pm

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked Apr 1, 2016 @ 11:03pm

Deadly Harvest

Kill an enemy by planting a hopper mine.



Get Some Grub

Squish every antlion grub in Episode Two.

Piñata Party

Find and break every web cache in Episode Two.

Hit and Run

Run over 20 enemies with the car in Episode Two.

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.

Little Rocket Man

Send the garden gnome into space.

Neighborhood Watch

Save all buildings outside the missile silo from destruction.

Payback

Kill a Hunter with its own flechettes.

Bone Breaker

Kill 30 enemies with thrown physics objects.

Hot Potat0wned

Kill a Combine soldier with his own grenade.

Grave Robber

Steal a Zombine's grenade.