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15 of 23 (65%) achievements earned:
Personal Achievements
 

Acid Reflex

Kill an acid antlion worker.
Unlocked 27 Mar, 2018 @ 3:14am

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 27 Mar, 2018 @ 3:30am

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 27 Mar, 2018 @ 4:16am

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 27 Mar, 2018 @ 5:13am

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 27 Mar, 2018 @ 5:39am

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 27 Mar, 2018 @ 8:03am

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked 27 Mar, 2018 @ 8:08am

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 27 Mar, 2018 @ 7:46am

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 27 Mar, 2018 @ 7:59am

Little Rocket Man

Send the garden gnome into space.
Unlocked 29 Mar, 2018 @ 7:19am

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 27 Mar, 2018 @ 8:22am

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 27 Mar, 2018 @ 9:51am

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 27 Mar, 2018 @ 3:24am

Grave Robber

Steal a Zombine's grenade.
Unlocked 27 Mar, 2018 @ 4:46am

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 17 Oct, 2023 @ 8:47am



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.

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.