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

Acid Reflex

Kill an acid antlion worker.
Unlocked 21 Jul, 2016 @ 8:43am

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 21 Jul, 2016 @ 9:32am

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 21 Jul, 2016 @ 10:38am

Hit and Run

Run over 20 enemies with the car in Episode Two.
Unlocked 21 Jul, 2016 @ 12:24pm

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 21 Jul, 2016 @ 11:52am

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 21 Jul, 2016 @ 12:19pm

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 21 Jul, 2016 @ 12:49pm

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked 17 Aug, 2018 @ 1:12pm

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 21 Jul, 2016 @ 12:29pm

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 21 Jul, 2016 @ 12:45pm

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 21 Jul, 2016 @ 1:16pm

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 21 Jul, 2016 @ 1:55pm

Bone Breaker

Kill 30 enemies with thrown physics objects.
Unlocked 21 Jul, 2016 @ 11:35am

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 16 Aug, 2018 @ 4:57pm

Grave Robber

Steal a Zombine's grenade.
Unlocked 20 Nov @ 9:02am

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 8 Mar, 2021 @ 5:50pm



Get Some Grub

Squish every antlion grub in Episode Two.

Piñata Party

Find and break every web cache 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.

Hot Potat0wned

Kill a Combine soldier with his own grenade.