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

Defiant

Hit the trashcan cop with the can.
Unlocked 12 Mar, 2020 @ 1:05pm

Submissive

Put the can in the trash.
Unlocked 27 May, 2011 @ 6:01am

Malcontent

Escape the apartment block raid.
Unlocked 27 May, 2011 @ 6:05am

What cat?

Break the mini-teleporter in Kleiner's lab.
Unlocked 12 May, 2012 @ 11:04am

Trusty Hardware

Get the crowbar.
Unlocked 27 May, 2011 @ 6:15am

Barnacle Bowling

Kill five barnacles with one barrel.
Unlocked 19 Aug, 2011 @ 8:36am

Anchor's Aweigh!

Get the airboat.
Unlocked 19 Aug, 2011 @ 9:22am

Heavy Weapons

Get the airboat's mounted gun.
Unlocked 19 Aug, 2011 @ 10:24am

Vorticough

Discover the hidden singing vortigaunt cave in chapter Water Hazard.
Unlocked 16 Jul, 2013 @ 8:02am

Revenge!

Destroy the hunter-chopper in Half-Life 2.
Unlocked 21 Aug, 2011 @ 4:19pm

Blast from the Past

Find the HEV Suit Charger faceplate in Eli's scrapyard.
Unlocked 21 Aug, 2011 @ 4:34pm

Zero-Point Energy

Get the Gravity Gun in Black Mesa East.
Unlocked 21 Aug, 2011 @ 4:34pm

Two Points

Use DOG's ball to make a basket in Eli's scrapyard.
Unlocked 12 Mar, 2020 @ 11:39am

Zombie Chopper

Play through Ravenholm using only the Gravity Gun.
Unlocked 16 Jul, 2013 @ 9:13am

Hallowed Ground

Escort Gregori safely through the church cemetery.
Unlocked 22 Aug, 2011 @ 9:27am

OSHA Violation

Kill 3 enemies using the crane.
Unlocked 23 Aug, 2011 @ 7:01am

Targetted Advertising

Pin a soldier to the billboard in chapter Highway 17.
Unlocked 23 Aug, 2011 @ 7:23am

Where Cubbage Fears to Tread

Defend Little Odessa from the gunship attack.
Unlocked 23 Aug, 2011 @ 6:51am

One Man Army

Destroy six gunships in Half-Life 2.
Unlocked 24 Aug, 2011 @ 2:57am

Keep Off the Sand!

Cross the antlion beach in chapter Sandtraps without touching the sand.
Unlocked 12 Mar, 2020 @ 12:59pm

Bug Hunt

Use the antlions to kill 50 enemies.
Unlocked 24 Aug, 2011 @ 2:49am

Flushed

Kill an enemy with a toilet.
Unlocked 24 Aug, 2011 @ 3:00am

Warden Freeman

Survive the second turret standoff in Nova Prospekt.
Unlocked 10 May, 2012 @ 5:33pm

Follow Freeman

Gain command of a squad of rebels in the uprising.
Unlocked 12 May, 2012 @ 11:09am

Radiation Levels Detected

Get through the toxic tunnel under City 17 in Half-Life 2.
Unlocked 12 May, 2012 @ 11:39am

Plaza Defender

Survive the generator plaza standoff in chapter Anticitizen One.
Unlocked 12 May, 2012 @ 12:10pm

Counter-Sniper

Kill all of the snipers in City 17.
Unlocked 12 Mar, 2020 @ 12:17pm

Fight the Power

Shut down the supression device by disabling its generators.
Unlocked 4 Jul, 2013 @ 9:00am

Giant Killer

Survive the rooftop strider battle in the ruins of City 17.
Unlocked 4 Jul, 2013 @ 9:44am

Atomizer

Disintegrate 15 soldiers by throwing them into a Combine ball field.
Unlocked 12 Mar, 2020 @ 12:01pm

Singularity Collapse

Destroy the Citadel's reactor core.
Unlocked 5 Jul, 2013 @ 2:26pm

Lambda Locator

Find all lambda caches in Half-Life 2.
Unlocked 12 Mar, 2020 @ 11:21am

Hack Attack!

Kill five enemies with a Manhack.
Unlocked 12 Mar, 2020 @ 12:05pm

Watch Your Head!

Make it to the bottom of the Citadel's main elevator shaft in one piece.
Unlocked 16 Nov @ 6:26pm

Containment

Contain the Citadel core.
Unlocked 16 Nov @ 6:26pm

Pacifist

Contain the Citadel core without killing any stalkers.
Unlocked 16 Nov @ 6:26pm

Car Crusher

Use the cars to squash 15 antlions in Episode One.
Unlocked 16 Nov @ 6:26pm

Elevator Action

Survive long enough to get on the parking garage elevator.
Unlocked 16 Nov @ 6:26pm

Live Bait

Help Alyx snipe 30 enemies in Episode One.
Unlocked 16 Nov @ 6:26pm

Attica!

Destroy the gunship in the hospital attic.
Unlocked 16 Nov @ 6:26pm

Citizen Escort

Don't let any citizens die when escorting them to the escape train.
Unlocked 16 Nov @ 6:26pm

Escape From City 17

Escape City 17 with Alyx.
Unlocked 16 Nov @ 6:26pm

The One Free Bullet

Finish the game firing exactly one bullet. Grenade, crowbar, rocket, and Gravity Gun kills are okay!
Unlocked 16 Nov @ 6:26pm

Conservationist

Kill five enemies with the same energy ball.
Unlocked 16 Nov @ 6:26pm

Think Fast!

Kill an Elite Soldier with his own energy ball.
Unlocked 16 Nov @ 6:26pm

Zombie-que

Use flares to light 15 zombies on fire.
Unlocked 16 Nov @ 6:26pm

Acid Reflex

Kill an acid antlion worker.
Unlocked 16 Nov @ 6:26pm

Get Some Grub

Squish every antlion grub in Episode Two.
Unlocked 16 Nov @ 6:26pm

Piñata Party

Find and break every web cache in Episode Two.
Unlocked 16 Nov @ 6:26pm

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 16 Nov @ 6:26pm

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 16 Nov @ 6:26pm

Hit and Run

Run over 20 enemies with the car in Episode Two.
Unlocked 16 Nov @ 6:26pm

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 16 Nov @ 6:26pm

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.
Unlocked 16 Nov @ 6:26pm

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 16 Nov @ 6:26pm

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 16 Nov @ 6:26pm

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked 16 Nov @ 6:26pm

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 16 Nov @ 6:26pm

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 16 Nov @ 6:26pm

Little Rocket Man

Send the garden gnome into space.
Unlocked 16 Nov @ 6:26pm

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 16 Nov @ 6:26pm

Neighborhood Watch

Save all buildings outside the missile silo from destruction.
Unlocked 16 Nov @ 6:26pm

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 16 Nov @ 6:26pm

Payback

Kill a Hunter with its own flechettes.
Unlocked 16 Nov @ 6:26pm

Bone Breaker

Kill 30 enemies with thrown physics objects.
Unlocked 16 Nov @ 6:26pm

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 16 Nov @ 6:26pm

Hot Potat0wned

Kill a Combine soldier with his own grenade.
Unlocked 16 Nov @ 6:26pm

Grave Robber

Steal a Zombine's grenade.
Unlocked 16 Nov @ 6:26pm

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 @ 6:26pm