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

Defiant

Hit the trashcan cop with the can.
Unlocked 6 Oct, 2013 @ 2:40am

Submissive

Put the can in the trash.
Unlocked 6 Oct, 2013 @ 5:20pm

Malcontent

Escape the apartment block raid.
Unlocked 6 Oct, 2013 @ 2:48am

What cat?

Break the mini-teleporter in Kleiner's lab.
Unlocked 6 Oct, 2013 @ 4:43am

Trusty Hardware

Get the crowbar.
Unlocked 6 Oct, 2013 @ 4:49am

Barnacle Bowling

Kill five barnacles with one barrel.
Unlocked 6 Oct, 2013 @ 5:08am

Anchor's Aweigh!

Get the airboat.
Unlocked 6 Oct, 2013 @ 5:40am

Heavy Weapons

Get the airboat's mounted gun.
Unlocked 6 Oct, 2013 @ 6:24am

Vorticough

Discover the hidden singing vortigaunt cave in chapter Water Hazard.
Unlocked 6 Oct, 2013 @ 5:13pm

Revenge!

Destroy the hunter-chopper in Half-Life 2.
Unlocked 6 Oct, 2013 @ 6:46am

Blast from the Past

Find the HEV Suit Charger faceplate in Eli's scrapyard.
Unlocked 6 Oct, 2013 @ 7:05am

Zero-Point Energy

Get the Gravity Gun in Black Mesa East.
Unlocked 6 Oct, 2013 @ 7:04am

Two Points

Use DOG's ball to make a basket in Eli's scrapyard.
Unlocked 6 Oct, 2013 @ 7:08am

Zombie Chopper

Play through Ravenholm using only the Gravity Gun.
Unlocked 6 Oct, 2013 @ 9:38am

Hallowed Ground

Escort Gregori safely through the church cemetery.
Unlocked 6 Oct, 2013 @ 9:24am

OSHA Violation

Kill 3 enemies using the crane.
Unlocked 6 Oct, 2013 @ 10:11am

Targetted Advertising

Pin a soldier to the billboard in chapter Highway 17.
Unlocked 6 Oct, 2013 @ 10:27am

Where Cubbage Fears to Tread

Defend Little Odessa from the gunship attack.
Unlocked 6 Oct, 2013 @ 10:03am

One Man Army

Destroy six gunships in Half-Life 2.
Unlocked 6 Oct, 2013 @ 12:05pm

Keep Off the Sand!

Cross the antlion beach in chapter Sandtraps without touching the sand.
Unlocked 6 Oct, 2013 @ 11:38am

Bug Hunt

Use the antlions to kill 50 enemies.
Unlocked 6 Oct, 2013 @ 12:00pm

Flushed

Kill an enemy with a toilet.
Unlocked 6 Oct, 2013 @ 12:08pm

Warden Freeman

Survive the second turret standoff in Nova Prospekt.
Unlocked 6 Oct, 2013 @ 1:40pm

Follow Freeman

Gain command of a squad of rebels in the uprising.
Unlocked 6 Oct, 2013 @ 2:01pm

Radiation Levels Detected

Get through the toxic tunnel under City 17 in Half-Life 2.
Unlocked 6 Oct, 2013 @ 2:33pm

Plaza Defender

Survive the generator plaza standoff in chapter Anticitizen One.
Unlocked 6 Oct, 2013 @ 2:51pm

Counter-Sniper

Kill all of the snipers in City 17.
Unlocked 7 Oct, 2013 @ 4:52am

Fight the Power

Shut down the supression device by disabling its generators.
Unlocked 6 Oct, 2013 @ 3:40pm

Giant Killer

Survive the rooftop strider battle in the ruins of City 17.
Unlocked 6 Oct, 2013 @ 6:31pm

Atomizer

Disintegrate 15 soldiers by throwing them into a Combine ball field.
Unlocked 6 Oct, 2013 @ 7:05pm

Singularity Collapse

Destroy the Citadel's reactor core.
Unlocked 6 Oct, 2013 @ 7:22pm

Lambda Locator

Find all lambda caches in Half-Life 2.
Unlocked 7 Oct, 2013 @ 7:02am

Hack Attack!

Kill five enemies with a Manhack.
Unlocked 6 Oct, 2013 @ 7:06pm

Watch Your Head!

Make it to the bottom of the Citadel's main elevator shaft in one piece.
Unlocked 3 Dec @ 1:52pm

Containment

Contain the Citadel core.
Unlocked 3 Dec @ 2:03pm

Pacifist

Contain the Citadel core without killing any stalkers.
Unlocked 3 Dec @ 2:03pm

Car Crusher

Use the cars to squash 15 antlions in Episode One.
Unlocked 3 Dec @ 4:32pm

Elevator Action

Survive long enough to get on the parking garage elevator.
Unlocked 3 Dec @ 2:33pm

Live Bait

Help Alyx snipe 30 enemies in Episode One.
Unlocked 3 Dec @ 4:58pm

Attica!

Destroy the gunship in the hospital attic.
Unlocked 3 Dec @ 3:33pm

Citizen Escort

Don't let any citizens die when escorting them to the escape train.
Unlocked 3 Dec @ 4:08pm

Escape From City 17

Escape City 17 with Alyx.
Unlocked 3 Dec @ 4:16pm

The One Free Bullet

Finish the game firing exactly one bullet. Grenade, crowbar, rocket, and Gravity Gun kills are okay!
Unlocked 3 Dec @ 4:16pm

Conservationist

Kill five enemies with the same energy ball.
Unlocked 3 Dec @ 4:29pm

Think Fast!

Kill an Elite Soldier with his own energy ball.
Unlocked 3 Dec @ 4:21pm

Zombie-que

Use flares to light 15 zombies on fire.
Unlocked 3 Dec @ 4:47pm

Acid Reflex

Kill an acid antlion worker.
Unlocked 4 Dec @ 8:40am

Get Some Grub

Squish every antlion grub in Episode Two.
Unlocked 4 Dec @ 2:44pm

Piñata Party

Find and break every web cache in Episode Two.
Unlocked 4 Dec @ 9:54am

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 4 Dec @ 9:06am

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 4 Dec @ 10:15am

Hit and Run

Run over 20 enemies with the car in Episode Two.
Unlocked 4 Dec @ 3:44pm

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 4 Dec @ 2:50pm

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.
Unlocked 4 Dec @ 3:26pm

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 4 Dec @ 3:38pm

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 4 Dec @ 4:08pm

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked 4 Dec @ 4:15pm

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 4 Dec @ 3:45pm

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 4 Dec @ 4:02pm

Little Rocket Man

Send the garden gnome into space.
Unlocked 4 Dec @ 4:21pm

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 4 Dec @ 4:36pm

Neighborhood Watch

Save all buildings outside the missile silo from destruction.
Unlocked 4 Dec @ 6:52pm

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 4 Dec @ 5:29pm

Payback

Kill a Hunter with its own flechettes.
Unlocked 4 Dec @ 2:44pm

Bone Breaker

Kill 30 enemies with thrown physics objects.
Unlocked 4 Dec @ 10:24am

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 4 Dec @ 9:05am

Hot Potat0wned

Kill a Combine soldier with his own grenade.
Unlocked 4 Dec @ 5:43pm

Grave Robber

Steal a Zombine's grenade.
Unlocked 4 Dec @ 10:30am

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 1 Dec @ 3:52pm