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

Defiant

Hit the trashcan cop with the can.
Unlocked 18 Aug, 2012 @ 7:42pm

Submissive

Put the can in the trash.
Unlocked 18 Aug, 2012 @ 7:42pm

Malcontent

Escape the apartment block raid.
Unlocked 3 Apr, 2011 @ 5:31am

What cat?

Break the mini-teleporter in Kleiner's lab.
Unlocked 3 Apr, 2011 @ 5:35am

Trusty Hardware

Get the crowbar.
Unlocked 4 Apr, 2011 @ 9:24am

Barnacle Bowling

Kill five barnacles with one barrel.
Unlocked 4 Apr, 2011 @ 9:39am

Anchor's Aweigh!

Get the airboat.
Unlocked 11 Apr, 2011 @ 7:30am

Heavy Weapons

Get the airboat's mounted gun.
Unlocked 11 Apr, 2011 @ 8:12am

Vorticough

Discover the hidden singing vortigaunt cave in chapter Water Hazard.
Unlocked 20 Aug, 2012 @ 5:07am

Revenge!

Destroy the hunter-chopper in Half-Life 2.
Unlocked 12 Apr, 2011 @ 9:18am

Blast from the Past

Find the HEV Suit Charger faceplate in Eli's scrapyard.
Unlocked 14 Aug, 2012 @ 7:37am

Zero-Point Energy

Get the Gravity Gun in Black Mesa East.
Unlocked 12 Apr, 2011 @ 9:49am

Two Points

Use DOG's ball to make a basket in Eli's scrapyard.
Unlocked 12 Apr, 2011 @ 9:54am

Zombie Chopper

Play through Ravenholm using only the Gravity Gun.
Unlocked 14 Aug, 2012 @ 8:26am

Hallowed Ground

Escort Gregori safely through the church cemetery.
Unlocked 27 Dec, 2011 @ 9:07am

OSHA Violation

Kill 3 enemies using the crane.
Unlocked 27 Dec, 2011 @ 9:33am

Targetted Advertising

Pin a soldier to the billboard in chapter Highway 17.
Unlocked 27 Dec, 2011 @ 9:40am

Where Cubbage Fears to Tread

Defend Little Odessa from the gunship attack.
Unlocked 27 Dec, 2011 @ 9:28am

One Man Army

Destroy six gunships in Half-Life 2.
Unlocked 29 Dec, 2011 @ 1:18am

Keep Off the Sand!

Cross the antlion beach in chapter Sandtraps without touching the sand.
Unlocked 20 Aug, 2012 @ 8:26am

Bug Hunt

Use the antlions to kill 50 enemies.
Unlocked 29 Dec, 2011 @ 1:14am

Flushed

Kill an enemy with a toilet.
Unlocked 20 Aug, 2012 @ 8:54am

Warden Freeman

Survive the second turret standoff in Nova Prospekt.
Unlocked 29 Dec, 2011 @ 10:57am

Follow Freeman

Gain command of a squad of rebels in the uprising.
Unlocked 29 Dec, 2011 @ 11:15am

Radiation Levels Detected

Get through the toxic tunnel under City 17 in Half-Life 2.
Unlocked 29 Dec, 2011 @ 11:42am

Plaza Defender

Survive the generator plaza standoff in chapter Anticitizen One.
Unlocked 29 Dec, 2011 @ 12:01pm

Counter-Sniper

Kill all of the snipers in City 17.
Unlocked 29 Dec, 2011 @ 12:20pm

Fight the Power

Shut down the supression device by disabling its generators.
Unlocked 29 Dec, 2011 @ 12:38pm

Giant Killer

Survive the rooftop strider battle in the ruins of City 17.
Unlocked 29 Dec, 2011 @ 12:57pm

Atomizer

Disintegrate 15 soldiers by throwing them into a Combine ball field.
Unlocked 14 Aug, 2012 @ 7:04am

Singularity Collapse

Destroy the Citadel's reactor core.
Unlocked 29 Dec, 2011 @ 1:33pm

Lambda Locator

Find all lambda caches in Half-Life 2.
Unlocked 20 Aug, 2012 @ 1:29pm

Hack Attack!

Kill five enemies with a Manhack.
Unlocked 20 Aug, 2012 @ 11:34am

Watch Your Head!

Make it to the bottom of the Citadel's main elevator shaft in one piece.
Unlocked 26 Nov @ 7:26pm

Containment

Contain the Citadel core.
Unlocked 26 Nov @ 7:26pm

Pacifist

Contain the Citadel core without killing any stalkers.
Unlocked 26 Nov @ 7:26pm

Car Crusher

Use the cars to squash 15 antlions in Episode One.
Unlocked 26 Nov @ 7:26pm

Elevator Action

Survive long enough to get on the parking garage elevator.
Unlocked 26 Nov @ 7:26pm

Live Bait

Help Alyx snipe 30 enemies in Episode One.
Unlocked 26 Nov @ 7:26pm

Attica!

Destroy the gunship in the hospital attic.
Unlocked 26 Nov @ 7:26pm

Citizen Escort

Don't let any citizens die when escorting them to the escape train.
Unlocked 26 Nov @ 7:26pm

Escape From City 17

Escape City 17 with Alyx.
Unlocked 26 Nov @ 7:26pm

The One Free Bullet

Finish the game firing exactly one bullet. Grenade, crowbar, rocket, and Gravity Gun kills are okay!
Unlocked 26 Nov @ 7:26pm

Conservationist

Kill five enemies with the same energy ball.
Unlocked 26 Nov @ 7:26pm

Think Fast!

Kill an Elite Soldier with his own energy ball.
Unlocked 26 Nov @ 7:26pm

Zombie-que

Use flares to light 15 zombies on fire.
Unlocked 26 Nov @ 7:26pm

Acid Reflex

Kill an acid antlion worker.
Unlocked 26 Nov @ 7:26pm

Get Some Grub

Squish every antlion grub in Episode Two.
Unlocked 26 Nov @ 7:26pm

Piñata Party

Find and break every web cache in Episode Two.
Unlocked 26 Nov @ 7:26pm

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 26 Nov @ 7:26pm

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 26 Nov @ 7:26pm

Hit and Run

Run over 20 enemies with the car in Episode Two.
Unlocked 26 Nov @ 7:26pm

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 26 Nov @ 7:26pm

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.
Unlocked 26 Nov @ 7:26pm

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 26 Nov @ 7:26pm

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 26 Nov @ 7:26pm

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked 26 Nov @ 7:26pm

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 26 Nov @ 7:26pm

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 26 Nov @ 7:26pm

Little Rocket Man

Send the garden gnome into space.
Unlocked 26 Nov @ 7:26pm

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 26 Nov @ 7:26pm

Neighborhood Watch

Save all buildings outside the missile silo from destruction.
Unlocked 26 Nov @ 7:26pm

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 26 Nov @ 7:26pm

Payback

Kill a Hunter with its own flechettes.
Unlocked 26 Nov @ 7:26pm

Bone Breaker

Kill 30 enemies with thrown physics objects.
Unlocked 26 Nov @ 7:26pm

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 26 Nov @ 7:26pm

Hot Potat0wned

Kill a Combine soldier with his own grenade.
Unlocked 26 Nov @ 7:26pm

Grave Robber

Steal a Zombine's grenade.
Unlocked 26 Nov @ 7:26pm

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 23 Nov @ 6:23pm