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

Defiant

Hit the trashcan cop with the can.
Unlocked 24 Jan, 2011 @ 5:02am

Submissive

Put the can in the trash.
Unlocked 26 Dec, 2011 @ 7:15am

Malcontent

Escape the apartment block raid.
Unlocked 24 Jan, 2011 @ 5:07am

What cat?

Break the mini-teleporter in Kleiner's lab.
Unlocked 26 Dec, 2011 @ 7:41am

Trusty Hardware

Get the crowbar.
Unlocked 26 Dec, 2011 @ 7:50am

Barnacle Bowling

Kill five barnacles with one barrel.
Unlocked 26 Dec, 2011 @ 8:04am

Anchor's Aweigh!

Get the airboat.
Unlocked 26 Dec, 2011 @ 8:39am

Heavy Weapons

Get the airboat's mounted gun.
Unlocked 4 Jan, 2011 @ 3:49am

Vorticough

Discover the hidden singing vortigaunt cave in chapter Water Hazard.
Unlocked 26 Dec, 2011 @ 10:40am

Revenge!

Destroy the hunter-chopper in Half-Life 2.
Unlocked 4 Jan, 2011 @ 3:58am

Blast from the Past

Find the HEV Suit Charger faceplate in Eli's scrapyard.
Unlocked 26 Dec, 2011 @ 10:54am

Zero-Point Energy

Get the Gravity Gun in Black Mesa East.
Unlocked 26 Dec, 2011 @ 10:55am

Two Points

Use DOG's ball to make a basket in Eli's scrapyard.
Unlocked 26 Dec, 2011 @ 11:04am

Zombie Chopper

Play through Ravenholm using only the Gravity Gun.
Unlocked 5 Jan, 2011 @ 11:42am

Hallowed Ground

Escort Gregori safely through the church cemetery.
Unlocked 5 Jan, 2011 @ 11:33am

OSHA Violation

Kill 3 enemies using the crane.
Unlocked 26 Dec, 2011 @ 11:22am

Targetted Advertising

Pin a soldier to the billboard in chapter Highway 17.
Unlocked 16 May, 2014 @ 3:07am

Where Cubbage Fears to Tread

Defend Little Odessa from the gunship attack.
Unlocked 26 Dec, 2011 @ 11:16am

One Man Army

Destroy six gunships in Half-Life 2.
Unlocked 18 May, 2014 @ 7:14am

Keep Off the Sand!

Cross the antlion beach in chapter Sandtraps without touching the sand.
Unlocked 21 Nov, 2012 @ 3:07am

Bug Hunt

Use the antlions to kill 50 enemies.
Unlocked 6 Jan, 2011 @ 4:06am

Flushed

Kill an enemy with a toilet.
Unlocked 6 Jan, 2011 @ 3:30am

Warden Freeman

Survive the second turret standoff in Nova Prospekt.
Unlocked 4 Jan, 2012 @ 1:23pm

Follow Freeman

Gain command of a squad of rebels in the uprising.
Unlocked 19 Nov, 2012 @ 8:36am

Radiation Levels Detected

Get through the toxic tunnel under City 17 in Half-Life 2.
Unlocked 19 Nov, 2012 @ 8:58am

Plaza Defender

Survive the generator plaza standoff in chapter Anticitizen One.
Unlocked 18 May, 2014 @ 5:56am

Counter-Sniper

Kill all of the snipers in City 17.
Unlocked 18 May, 2014 @ 6:23am

Fight the Power

Shut down the supression device by disabling its generators.
Unlocked 18 May, 2014 @ 7:09am

Giant Killer

Survive the rooftop strider battle in the ruins of City 17.
Unlocked 19 May, 2014 @ 2:20am

Atomizer

Disintegrate 15 soldiers by throwing them into a Combine ball field.
Unlocked 19 May, 2014 @ 2:37am

Singularity Collapse

Destroy the Citadel's reactor core.
Unlocked 19 May, 2014 @ 3:01am

Lambda Locator

Find all lambda caches in Half-Life 2.
Unlocked 19 May, 2014 @ 2:08am

Hack Attack!

Kill five enemies with a Manhack.
Unlocked 16 May, 2014 @ 10:22am

Watch Your Head!

Make it to the bottom of the Citadel's main elevator shaft in one piece.
Unlocked 17 Nov @ 9:54am

Containment

Contain the Citadel core.
Unlocked 17 Nov @ 9:54am

Pacifist

Contain the Citadel core without killing any stalkers.
Unlocked 17 Nov @ 9:54am

Car Crusher

Use the cars to squash 15 antlions in Episode One.
Unlocked 17 Nov @ 9:54am

Elevator Action

Survive long enough to get on the parking garage elevator.
Unlocked 17 Nov @ 9:54am

Live Bait

Help Alyx snipe 30 enemies in Episode One.
Unlocked 17 Nov @ 9:54am

Attica!

Destroy the gunship in the hospital attic.
Unlocked 17 Nov @ 9:54am

Citizen Escort

Don't let any citizens die when escorting them to the escape train.
Unlocked 17 Nov @ 9:54am

Escape From City 17

Escape City 17 with Alyx.
Unlocked 17 Nov @ 9:54am

The One Free Bullet

Finish the game firing exactly one bullet. Grenade, crowbar, rocket, and Gravity Gun kills are okay!
Unlocked 17 Nov @ 9:54am

Conservationist

Kill five enemies with the same energy ball.
Unlocked 17 Nov @ 9:54am

Think Fast!

Kill an Elite Soldier with his own energy ball.
Unlocked 17 Nov @ 9:54am

Zombie-que

Use flares to light 15 zombies on fire.
Unlocked 17 Nov @ 9:54am

Acid Reflex

Kill an acid antlion worker.
Unlocked 17 Nov @ 9:57am

Get Some Grub

Squish every antlion grub in Episode Two.
Unlocked 17 Nov @ 9:57am

Piñata Party

Find and break every web cache in Episode Two.
Unlocked 17 Nov @ 9:57am

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 17 Nov @ 9:57am

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 17 Nov @ 9:57am

Hit and Run

Run over 20 enemies with the car in Episode Two.
Unlocked 17 Nov @ 9:57am

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 17 Nov @ 9:57am

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.
Unlocked 17 Nov @ 9:57am

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 17 Nov @ 9:57am

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 17 Nov @ 9:57am

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked 17 Nov @ 9:57am

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 17 Nov @ 9:57am

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 17 Nov @ 9:57am

Little Rocket Man

Send the garden gnome into space.
Unlocked 17 Nov @ 9:57am

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 17 Nov @ 9:57am

Neighborhood Watch

Save all buildings outside the missile silo from destruction.
Unlocked 17 Nov @ 9:57am

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 17 Nov @ 9:57am

Payback

Kill a Hunter with its own flechettes.
Unlocked 17 Nov @ 9:57am

Bone Breaker

Kill 30 enemies with thrown physics objects.
Unlocked 17 Nov @ 9:57am

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 17 Nov @ 9:57am

Hot Potat0wned

Kill a Combine soldier with his own grenade.
Unlocked 17 Nov @ 9:57am

Grave Robber

Steal a Zombine's grenade.
Unlocked 17 Nov @ 9:57am

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 Nov @ 9:55am