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16 of 23 (70%) achievements earned:
Personal Achievements
 

Acid Reflex

Kill an acid antlion worker.
Unlocked 5 Aug @ 5:45am

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 5 Aug @ 6:14am

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 5 Aug @ 7:10am

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 6 Aug @ 7:59am

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.
Unlocked 6 Aug @ 8:25am

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 6 Aug @ 8:39am

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 6 Aug @ 9:02am

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked 6 Aug @ 9:07am

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 6 Aug @ 8:44am

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 6 Aug @ 8:56am

Little Rocket Man

Send the garden gnome into space.
Unlocked 6 Aug @ 9:14am

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 6 Aug @ 9:26am

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 6 Aug @ 12:22pm

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 5 Aug @ 6:03am

Grave Robber

Steal a Zombine's grenade.
Unlocked 6 Aug @ 8:29am

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 5 Aug @ 5:18am



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.

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.