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69 of 69 (100%) achievements earned:
Personal Achievements
 

Defiant

Hit the trashcan cop with the can.
Unlocked 22 May, 2018 @ 9:22am

Submissive

Put the can in the trash.
Unlocked 9 Jan, 2018 @ 7:29am

Malcontent

Escape the apartment block raid.
Unlocked 23 Nov, 2017 @ 1:39am

What cat?

Break the mini-teleporter in Kleiner's lab.
Unlocked 23 Nov, 2017 @ 1:44am

Trusty Hardware

Get the crowbar.
Unlocked 23 Nov, 2017 @ 1:50am

Barnacle Bowling

Kill five barnacles with one barrel.
Unlocked 23 Nov, 2017 @ 8:47pm

Anchor's Aweigh!

Get the airboat.
Unlocked 24 Nov, 2017 @ 6:26am

Heavy Weapons

Get the airboat's mounted gun.
Unlocked 24 Nov, 2017 @ 7:18am

Vorticough

Discover the hidden singing vortigaunt cave in chapter Water Hazard.
Unlocked 24 Nov, 2017 @ 7:34am

Revenge!

Destroy the hunter-chopper in Half-Life 2.
Unlocked 24 Nov, 2017 @ 7:32am

Blast from the Past

Find the HEV Suit Charger faceplate in Eli's scrapyard.
Unlocked 24 Nov, 2017 @ 8:12am

Zero-Point Energy

Get the Gravity Gun in Black Mesa East.
Unlocked 24 Nov, 2017 @ 8:12am

Two Points

Use DOG's ball to make a basket in Eli's scrapyard.
Unlocked 2 May, 2018 @ 10:00am

Zombie Chopper

Play through Ravenholm using only the Gravity Gun.
Unlocked 25 May, 2018 @ 12:24pm

Hallowed Ground

Escort Gregori safely through the church cemetery.
Unlocked 2 May, 2018 @ 10:49am

OSHA Violation

Kill 3 enemies using the crane.
Unlocked 26 May, 2018 @ 12:13am

Targetted Advertising

Pin a soldier to the billboard in chapter Highway 17.
Unlocked 26 Nov, 2017 @ 10:40pm

Where Cubbage Fears to Tread

Defend Little Odessa from the gunship attack.
Unlocked 26 Nov, 2017 @ 9:09pm

One Man Army

Destroy six gunships in Half-Life 2.
Unlocked 25 Nov, 2019 @ 10:30am

Keep Off the Sand!

Cross the antlion beach in chapter Sandtraps without touching the sand.
Unlocked 26 May, 2018 @ 3:48am

Bug Hunt

Use the antlions to kill 50 enemies.
Unlocked 28 Nov, 2017 @ 8:35am

Flushed

Kill an enemy with a toilet.
Unlocked 28 Nov, 2017 @ 8:12am

Warden Freeman

Survive the second turret standoff in Nova Prospekt.
Unlocked 26 May, 2018 @ 11:35am

Follow Freeman

Gain command of a squad of rebels in the uprising.
Unlocked 26 May, 2018 @ 1:25pm

Radiation Levels Detected

Get through the toxic tunnel under City 17 in Half-Life 2.
Unlocked 28 Nov, 2017 @ 8:33pm

Plaza Defender

Survive the generator plaza standoff in chapter Anticitizen One.
Unlocked 27 May, 2018 @ 1:06am

Counter-Sniper

Kill all of the snipers in City 17.
Unlocked 28 Apr, 2019 @ 12:11pm

Fight the Power

Shut down the supression device by disabling its generators.
Unlocked 27 May, 2018 @ 10:17am

Giant Killer

Survive the rooftop strider battle in the ruins of City 17.
Unlocked 1 Dec, 2017 @ 7:48am

Atomizer

Disintegrate 15 soldiers by throwing them into a Combine ball field.
Unlocked 29 May, 2018 @ 2:12am

Singularity Collapse

Destroy the Citadel's reactor core.
Unlocked 29 May, 2018 @ 2:34am

Lambda Locator

Find all lambda caches in Half-Life 2.
Unlocked 30 Apr, 2019 @ 10:13am

Hack Attack!

Kill five enemies with a Manhack.
Unlocked 28 Nov, 2017 @ 8:29pm

Watch Your Head!

Make it to the bottom of the Citadel's main elevator shaft in one piece.
Unlocked 17 Nov @ 5:30am

Containment

Contain the Citadel core.
Unlocked 17 Nov @ 5:52am

Pacifist

Contain the Citadel core without killing any stalkers.
Unlocked 17 Nov @ 5:52am

Car Crusher

Use the cars to squash 15 antlions in Episode One.
Unlocked 17 Nov @ 8:38am

Elevator Action

Survive long enough to get on the parking garage elevator.
Unlocked 17 Nov @ 6:33am

Live Bait

Help Alyx snipe 30 enemies in Episode One.
Unlocked 17 Nov @ 8:51am

Attica!

Destroy the gunship in the hospital attic.
Unlocked 17 Nov @ 9:32am

Citizen Escort

Don't let any citizens die when escorting them to the escape train.
Unlocked 17 Nov @ 10:04am

Escape From City 17

Escape City 17 with Alyx.
Unlocked 17 Nov @ 10:13am

The One Free Bullet

Finish the game firing exactly one bullet. Grenade, crowbar, rocket, and Gravity Gun kills are okay!
Unlocked 17 Nov @ 10:13am

Conservationist

Kill five enemies with the same energy ball.
Unlocked 20 Nov @ 9:22am

Think Fast!

Kill an Elite Soldier with his own energy ball.
Unlocked 17 Nov @ 5:31am

Zombie-que

Use flares to light 15 zombies on fire.
Unlocked 20 Nov @ 9:42am

Acid Reflex

Kill an acid antlion worker.
Unlocked 16 Nov @ 1:19am

Get Some Grub

Squish every antlion grub in Episode Two.
Unlocked 22 Nov @ 10:02am

Piñata Party

Find and break every web cache in Episode Two.
Unlocked 22 Nov @ 8:08am

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 16 Nov @ 1:19am

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 16 Nov @ 1:19am

Hit and Run

Run over 20 enemies with the car in Episode Two.
Unlocked 19 Nov @ 7:04am

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 16 Nov @ 1:19am

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.
Unlocked 19 Nov @ 6:48am

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 16 Nov @ 1:19am

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 19 Nov @ 8:44am

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked 19 Nov @ 8:49am

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 19 Nov @ 8:10am

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 16 Nov @ 1:19am

Little Rocket Man

Send the garden gnome into space.
Unlocked 22 Nov @ 4:26pm

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 16 Nov @ 1:19am

Neighborhood Watch

Save all buildings outside the missile silo from destruction.
Unlocked 19 Nov @ 10:04am

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 19 Nov @ 10:04am

Payback

Kill a Hunter with its own flechettes.
Unlocked 18 Nov @ 10:45am

Bone Breaker

Kill 30 enemies with thrown physics objects.
Unlocked 18 Nov @ 7:39am

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 16 Nov @ 1:19am

Hot Potat0wned

Kill a Combine soldier with his own grenade.
Unlocked 19 Nov @ 5:41am

Grave Robber

Steal a Zombine's grenade.
Unlocked 16 Nov @ 1:19am

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 16 Nov @ 1:19am