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

Defiant

Hit the trashcan cop with the can.
Unlocked 22 Jul, 2013 @ 6:16pm

Submissive

Put the can in the trash.
Unlocked 19 Jul, 2013 @ 2:29pm

Malcontent

Escape the apartment block raid.
Unlocked 19 Jul, 2013 @ 2:34pm

What cat?

Break the mini-teleporter in Kleiner's lab.
Unlocked 19 Jul, 2013 @ 2:41pm

Trusty Hardware

Get the crowbar.
Unlocked 20 Jul, 2013 @ 1:10pm

Barnacle Bowling

Kill five barnacles with one barrel.
Unlocked 20 Jul, 2013 @ 1:19pm

Anchor's Aweigh!

Get the airboat.
Unlocked 20 Jul, 2013 @ 6:56pm

Heavy Weapons

Get the airboat's mounted gun.
Unlocked 20 Jul, 2013 @ 11:38pm

Vorticough

Discover the hidden singing vortigaunt cave in chapter Water Hazard.
Unlocked 20 Jul, 2013 @ 11:52pm

Revenge!

Destroy the hunter-chopper in Half-Life 2.
Unlocked 20 Jul, 2013 @ 11:49pm

Blast from the Past

Find the HEV Suit Charger faceplate in Eli's scrapyard.
Unlocked 21 Jul, 2013 @ 12:22am

Zero-Point Energy

Get the Gravity Gun in Black Mesa East.
Unlocked 21 Jul, 2013 @ 12:08am

Two Points

Use DOG's ball to make a basket in Eli's scrapyard.
Unlocked 22 Jul, 2013 @ 6:29pm

Zombie Chopper

Play through Ravenholm using only the Gravity Gun.
Unlocked 22 Jul, 2013 @ 7:01pm

Hallowed Ground

Escort Gregori safely through the church cemetery.
Unlocked 21 Jul, 2013 @ 1:04am

OSHA Violation

Kill 3 enemies using the crane.
Unlocked 21 Jul, 2013 @ 1:33am

Targetted Advertising

Pin a soldier to the billboard in chapter Highway 17.
Unlocked 21 Jul, 2013 @ 1:40am

Where Cubbage Fears to Tread

Defend Little Odessa from the gunship attack.
Unlocked 21 Jul, 2013 @ 1:26am

One Man Army

Destroy six gunships in Half-Life 2.
Unlocked 21 Jul, 2013 @ 4:11pm

Keep Off the Sand!

Cross the antlion beach in chapter Sandtraps without touching the sand.
Unlocked 21 Jul, 2013 @ 2:24pm

Bug Hunt

Use the antlions to kill 50 enemies.
Unlocked 21 Jul, 2013 @ 4:06pm

Flushed

Kill an enemy with a toilet.
Unlocked 23 Jul, 2013 @ 12:22pm

Warden Freeman

Survive the second turret standoff in Nova Prospekt.
Unlocked 21 Jul, 2013 @ 5:07pm

Follow Freeman

Gain command of a squad of rebels in the uprising.
Unlocked 21 Jul, 2013 @ 5:24pm

Radiation Levels Detected

Get through the toxic tunnel under City 17 in Half-Life 2.
Unlocked 21 Jul, 2013 @ 10:09pm

Plaza Defender

Survive the generator plaza standoff in chapter Anticitizen One.
Unlocked 22 Jul, 2013 @ 3:39am

Counter-Sniper

Kill all of the snipers in City 17.
Unlocked 23 Jul, 2013 @ 12:19pm

Fight the Power

Shut down the supression device by disabling its generators.
Unlocked 22 Jul, 2013 @ 8:20am

Giant Killer

Survive the rooftop strider battle in the ruins of City 17.
Unlocked 22 Jul, 2013 @ 8:39am

Atomizer

Disintegrate 15 soldiers by throwing them into a Combine ball field.
Unlocked 22 Jul, 2013 @ 5:38pm

Singularity Collapse

Destroy the Citadel's reactor core.
Unlocked 22 Jul, 2013 @ 6:04pm

Lambda Locator

Find all lambda caches in Half-Life 2.
Unlocked 23 Jul, 2013 @ 7:36pm

Hack Attack!

Kill five enemies with a Manhack.
Unlocked 21 Jul, 2013 @ 5:06pm

Watch Your Head!

Make it to the bottom of the Citadel's main elevator shaft in one piece.
Unlocked 21 Nov @ 6:29pm

Containment

Contain the Citadel core.
Unlocked 21 Nov @ 6:29pm

Pacifist

Contain the Citadel core without killing any stalkers.
Unlocked 21 Nov @ 6:29pm

Car Crusher

Use the cars to squash 15 antlions in Episode One.
Unlocked 21 Nov @ 6:29pm

Elevator Action

Survive long enough to get on the parking garage elevator.
Unlocked 21 Nov @ 6:29pm

Live Bait

Help Alyx snipe 30 enemies in Episode One.
Unlocked 21 Nov @ 6:29pm

Attica!

Destroy the gunship in the hospital attic.
Unlocked 21 Nov @ 6:29pm

Citizen Escort

Don't let any citizens die when escorting them to the escape train.
Unlocked 21 Nov @ 6:29pm

Escape From City 17

Escape City 17 with Alyx.
Unlocked 21 Nov @ 6:29pm

The One Free Bullet

Finish the game firing exactly one bullet. Grenade, crowbar, rocket, and Gravity Gun kills are okay!
Unlocked 21 Nov @ 6:29pm

Conservationist

Kill five enemies with the same energy ball.
Unlocked 21 Nov @ 6:29pm

Think Fast!

Kill an Elite Soldier with his own energy ball.
Unlocked 21 Nov @ 6:29pm

Zombie-que

Use flares to light 15 zombies on fire.
Unlocked 21 Nov @ 6:29pm

Acid Reflex

Kill an acid antlion worker.
Unlocked 21 Nov @ 6:29pm

Get Some Grub

Squish every antlion grub in Episode Two.
Unlocked 21 Nov @ 6:29pm

Piñata Party

Find and break every web cache in Episode Two.
Unlocked 21 Nov @ 6:29pm

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 21 Nov @ 6:29pm

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 21 Nov @ 6:29pm

Hit and Run

Run over 20 enemies with the car in Episode Two.
Unlocked 21 Nov @ 6:29pm

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 21 Nov @ 6:29pm

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.
Unlocked 21 Nov @ 6:29pm

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 21 Nov @ 6:29pm

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 21 Nov @ 6:29pm

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked 21 Nov @ 6:29pm

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 21 Nov @ 6:29pm

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 21 Nov @ 6:29pm

Little Rocket Man

Send the garden gnome into space.
Unlocked 21 Nov @ 6:29pm

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 21 Nov @ 6:29pm

Neighborhood Watch

Save all buildings outside the missile silo from destruction.
Unlocked 21 Nov @ 6:29pm

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 21 Nov @ 6:29pm

Payback

Kill a Hunter with its own flechettes.
Unlocked 21 Nov @ 6:29pm

Bone Breaker

Kill 30 enemies with thrown physics objects.
Unlocked 21 Nov @ 6:29pm

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 21 Nov @ 6:29pm

Hot Potat0wned

Kill a Combine soldier with his own grenade.
Unlocked 21 Nov @ 6:29pm

Grave Robber

Steal a Zombine's grenade.
Unlocked 21 Nov @ 6:29pm

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 21 Nov @ 5:26pm