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

Defiant

Hit the trashcan cop with the can.

Submissive

Put the can in the trash.
Unlocked 24 Nov @ 9:05pm

Malcontent

Escape the apartment block raid.

What cat?

Break the mini-teleporter in Kleiner's lab.

Trusty Hardware

Get the crowbar.

Barnacle Bowling

Kill five barnacles with one barrel.

Anchor's Aweigh!

Get the airboat.
Unlocked 20 Jun, 2010 @ 1:25pm

Heavy Weapons

Get the airboat's mounted gun.

Vorticough

Discover the hidden singing vortigaunt cave in chapter Water Hazard.
Unlocked 25 Nov @ 8:26pm

Revenge!

Destroy the hunter-chopper in Half-Life 2.

Blast from the Past

Find the HEV Suit Charger faceplate in Eli's scrapyard.

Zero-Point Energy

Get the Gravity Gun in Black Mesa East.

Two Points

Use DOG's ball to make a basket in Eli's scrapyard.
Unlocked 26 Nov @ 7:02pm

Zombie Chopper

Play through Ravenholm using only the Gravity Gun.
Unlocked 26 Nov @ 8:35pm

Hallowed Ground

Escort Gregori safely through the church cemetery.

OSHA Violation

Kill 3 enemies using the crane.
Unlocked 21 Jun, 2010 @ 3:32pm

Targetted Advertising

Pin a soldier to the billboard in chapter Highway 17.
Unlocked 22 Jun, 2010 @ 6:52am

Where Cubbage Fears to Tread

Defend Little Odessa from the gunship attack.

One Man Army

Destroy six gunships in Half-Life 2.
Unlocked 29 Nov @ 8:05pm

Keep Off the Sand!

Cross the antlion beach in chapter Sandtraps without touching the sand.
Unlocked 29 Nov @ 7:31pm

Bug Hunt

Use the antlions to kill 50 enemies.
Unlocked 23 Jun, 2010 @ 9:04am

Flushed

Kill an enemy with a toilet.
Unlocked 28 Jun, 2010 @ 3:24am

Warden Freeman

Survive the second turret standoff in Nova Prospekt.
Unlocked 28 Jun, 2010 @ 1:43am

Follow Freeman

Gain command of a squad of rebels in the uprising.
Unlocked 28 Jun, 2010 @ 2:03am

Radiation Levels Detected

Get through the toxic tunnel under City 17 in Half-Life 2.
Unlocked 28 Jun, 2010 @ 2:39am

Plaza Defender

Survive the generator plaza standoff in chapter Anticitizen One.
Unlocked 28 Jun, 2010 @ 3:04am

Counter-Sniper

Kill all of the snipers in City 17.
Unlocked 30 Nov @ 6:19pm

Fight the Power

Shut down the supression device by disabling its generators.
Unlocked 28 Jun, 2010 @ 3:47am

Giant Killer

Survive the rooftop strider battle in the ruins of City 17.
Unlocked 1 Jul, 2010 @ 5:10am

Atomizer

Disintegrate 15 soldiers by throwing them into a Combine ball field.
Unlocked 1 Jul, 2010 @ 5:36am

Singularity Collapse

Destroy the Citadel's reactor core.
Unlocked 1 Jul, 2010 @ 6:00am

Lambda Locator

Find all lambda caches in Half-Life 2.
Unlocked 30 Nov @ 7:18pm

Hack Attack!

Kill five enemies with a Manhack.
Unlocked 28 Jun, 2010 @ 2:27am

Watch Your Head!

Make it to the bottom of the Citadel's main elevator shaft in one piece.
Unlocked 24 Nov @ 9:09pm

Containment

Contain the Citadel core.
Unlocked 24 Nov @ 9:09pm

Pacifist

Contain the Citadel core without killing any stalkers.
Unlocked 24 Nov @ 9:09pm

Car Crusher

Use the cars to squash 15 antlions in Episode One.
Unlocked 24 Nov @ 9:09pm

Elevator Action

Survive long enough to get on the parking garage elevator.
Unlocked 24 Nov @ 9:09pm

Live Bait

Help Alyx snipe 30 enemies in Episode One.
Unlocked 24 Nov @ 9:09pm

Attica!

Destroy the gunship in the hospital attic.
Unlocked 24 Nov @ 9:09pm

Citizen Escort

Don't let any citizens die when escorting them to the escape train.
Unlocked 24 Nov @ 9:09pm

Escape From City 17

Escape City 17 with Alyx.
Unlocked 24 Nov @ 9:09pm

The One Free Bullet

Finish the game firing exactly one bullet. Grenade, crowbar, rocket, and Gravity Gun kills are okay!
Unlocked 4 Dec @ 6:49pm

Conservationist

Kill five enemies with the same energy ball.
Unlocked 24 Nov @ 9:09pm

Think Fast!

Kill an Elite Soldier with his own energy ball.
Unlocked 24 Nov @ 9:09pm

Zombie-que

Use flares to light 15 zombies on fire.
Unlocked 7 Dec @ 8:18pm

Acid Reflex

Kill an acid antlion worker.
Unlocked 24 Nov @ 9:09pm

Get Some Grub

Squish every antlion grub in Episode Two.
Unlocked 24 Nov @ 9:09pm

Piñata Party

Find and break every web cache in Episode Two.
Unlocked 24 Nov @ 9:09pm

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 24 Nov @ 9:09pm

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 24 Nov @ 9:09pm

Hit and Run

Run over 20 enemies with the car in Episode Two.
Unlocked 24 Nov @ 9:09pm

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 24 Nov @ 9:09pm

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.
Unlocked 4 Dec @ 9:37pm

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 24 Nov @ 9:09pm

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 24 Nov @ 9:09pm

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked 24 Nov @ 9:09pm

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 24 Nov @ 9:09pm

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 24 Nov @ 9:09pm

Little Rocket Man

Send the garden gnome into space.
Unlocked 24 Nov @ 9:09pm

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 24 Nov @ 9:09pm

Neighborhood Watch

Save all buildings outside the missile silo from destruction.
Unlocked 7 Dec @ 7:48pm

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 24 Nov @ 9:09pm

Payback

Kill a Hunter with its own flechettes.
Unlocked 24 Nov @ 9:09pm

Bone Breaker

Kill 30 enemies with thrown physics objects.
Unlocked 24 Nov @ 9:09pm

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 24 Nov @ 9:09pm

Hot Potat0wned

Kill a Combine soldier with his own grenade.
Unlocked 24 Nov @ 9:09pm

Grave Robber

Steal a Zombine's grenade.
Unlocked 24 Nov @ 9:09pm

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 24 Nov @ 9:09pm