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23 of 23 (100%) achievements earned:
Personal Achievements
 

Acid Reflex

Kill an acid antlion worker.
Unlocked 4 Sep, 2021 @ 4:33pm

Get Some Grub

Squish every antlion grub in Episode Two.
Unlocked 5 Sep, 2021 @ 10:28pm

Piñata Party

Find and break every web cache in Episode Two.
Unlocked 4 Sep, 2021 @ 6:51pm

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 4 Sep, 2021 @ 5:13pm

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 4 Sep, 2021 @ 7:27pm

Hit and Run

Run over 20 enemies with the car in Episode Two.
Unlocked 7 Sep, 2021 @ 6:10pm

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 6 Sep, 2021 @ 5:56pm

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.
Unlocked 6 Sep, 2021 @ 10:08pm

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 7 Sep, 2021 @ 6:05pm

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 7 Sep, 2021 @ 7:02pm

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked 7 Sep, 2021 @ 7:15pm

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 7 Sep, 2021 @ 6:29pm

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 7 Sep, 2021 @ 6:55pm

Little Rocket Man

Send the garden gnome into space.
Unlocked 7 Sep, 2021 @ 7:34pm

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 7 Sep, 2021 @ 7:52pm

Neighborhood Watch

Save all buildings outside the missile silo from destruction.
Unlocked 7 Sep, 2021 @ 10:39pm

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 7 Sep, 2021 @ 10:39pm

Payback

Kill a Hunter with its own flechettes.
Unlocked 6 Sep, 2021 @ 5:55pm

Bone Breaker

Kill 30 enemies with thrown physics objects.
Unlocked 4 Sep, 2021 @ 8:08pm

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 4 Sep, 2021 @ 5:02pm

Hot Potat0wned

Kill a Combine soldier with his own grenade.
Unlocked 7 Sep, 2021 @ 6:54pm

Grave Robber

Steal a Zombine's grenade.
Unlocked 4 Sep, 2021 @ 5:34pm

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 Sep, 2021 @ 5:43pm