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17 of 23 (74%) achievements earned:
Personal Achievements
 

Acid Reflex

Kill an acid antlion worker.
Unlocked 21 Mar, 2016 @ 3:21pm

Piñata Party

Find and break every web cache in Episode Two.
Unlocked 8 Nov @ 3:29pm

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 21 Mar, 2016 @ 3:49pm

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 23 Mar, 2016 @ 2:16pm

Hit and Run

Run over 20 enemies with the car in Episode Two.
Unlocked 9 Nov @ 12:06pm

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 25 Mar, 2016 @ 8:14am

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 28 Mar, 2016 @ 2:52pm

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 9 Nov @ 11:15am

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 28 Mar, 2016 @ 2:56pm

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 29 Mar, 2016 @ 2:41pm

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 30 Mar, 2016 @ 7:19am

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 30 Mar, 2016 @ 2:30pm

Payback

Kill a Hunter with its own flechettes.
Unlocked 30 Mar, 2016 @ 7:56am

Bone Breaker

Kill 30 enemies with thrown physics objects.
Unlocked 30 Mar, 2016 @ 7:54am

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 21 Mar, 2016 @ 3:48pm

Grave Robber

Steal a Zombine's grenade.
Unlocked 22 Mar, 2016 @ 2:37pm

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 3 Nov @ 6:29am



Get Some Grub

Squish every antlion grub in Episode Two.

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.

Pedal to the Metal

Beat DOG in a race to the White Forest base.

Little Rocket Man

Send the garden gnome into space.

Neighborhood Watch

Save all buildings outside the missile silo from destruction.

Hot Potat0wned

Kill a Combine soldier with his own grenade.