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12 of 23 (52%) achievements earned:
Personal Achievements
 

Acid Reflex

Kill an acid antlion worker.
Unlocked 17 Aug @ 1:39pm

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 17 Aug @ 1:57pm

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 25 Dec @ 12:35pm

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 25 Dec @ 1:10pm

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 25 Dec @ 1:34pm

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 26 Dec @ 5:28am

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked 26 Dec @ 5:33am

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 25 Dec @ 1:39pm

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 26 Dec @ 5:24am

Bone Breaker

Kill 30 enemies with thrown physics objects.
Unlocked 25 Dec @ 1:29pm

Grave Robber

Steal a Zombine's grenade.
Unlocked 25 Dec @ 12:54pm

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 18 Oct, 2023 @ 8:18am



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.

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.

Little Rocket Man

Send the garden gnome into space.

Secondary Silo Secured

Secure the launch doors on missile silo 2.

Neighborhood Watch

Save all buildings outside the missile silo from destruction.

Defense of the Armament

Save the missile silo from the Combine offensive.

Payback

Kill a Hunter with its own flechettes.

Deadly Harvest

Kill an enemy by planting a hopper mine.

Hot Potat0wned

Kill a Combine soldier with his own grenade.