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61 of 69 (88%) achievements earned:
Personal Achievements
 

Defiant

Hit the trashcan cop with the can.
Unlocked 22 Jul, 2010 @ 5:13am

Submissive

Put the can in the trash.
Unlocked 6 Aug, 2011 @ 7:48am

Malcontent

Escape the apartment block raid.
Unlocked 22 Jul, 2010 @ 5:24am

Trusty Hardware

Get the crowbar.
Unlocked 22 Jul, 2010 @ 5:36am

Barnacle Bowling

Kill five barnacles with one barrel.
Unlocked 22 Jul, 2010 @ 6:02am

Anchor's Aweigh!

Get the airboat.
Unlocked 22 Jul, 2010 @ 7:13am

Heavy Weapons

Get the airboat's mounted gun.
Unlocked 23 Jul, 2010 @ 1:22am

Vorticough

Discover the hidden singing vortigaunt cave in chapter Water Hazard.
Unlocked 23 Jul, 2010 @ 1:51am

Revenge!

Destroy the hunter-chopper in Half-Life 2.
Unlocked 23 Jul, 2010 @ 1:43am

Blast from the Past

Find the HEV Suit Charger faceplate in Eli's scrapyard.
Unlocked 23 Jul, 2010 @ 3:08am

Zero-Point Energy

Get the Gravity Gun in Black Mesa East.
Unlocked 23 Jul, 2010 @ 3:10am

Two Points

Use DOG's ball to make a basket in Eli's scrapyard.
Unlocked 23 Jul, 2010 @ 3:49am

Zombie Chopper

Play through Ravenholm using only the Gravity Gun.
Unlocked 23 Jul, 2010 @ 5:29am

Hallowed Ground

Escort Gregori safely through the church cemetery.
Unlocked 23 Jul, 2010 @ 5:13am

OSHA Violation

Kill 3 enemies using the crane.
Unlocked 23 Jul, 2010 @ 8:20am

Targetted Advertising

Pin a soldier to the billboard in chapter Highway 17.
Unlocked 23 Jul, 2010 @ 9:22am

Where Cubbage Fears to Tread

Defend Little Odessa from the gunship attack.
Unlocked 23 Jul, 2010 @ 8:12am

One Man Army

Destroy six gunships in Half-Life 2.
Unlocked 23 Jul, 2010 @ 12:18pm

Keep Off the Sand!

Cross the antlion beach in chapter Sandtraps without touching the sand.
Unlocked 23 Jul, 2010 @ 11:45am

Bug Hunt

Use the antlions to kill 50 enemies.
Unlocked 23 Jul, 2010 @ 12:50pm

Flushed

Kill an enemy with a toilet.
Unlocked 23 Jul, 2010 @ 12:20pm

Warden Freeman

Survive the second turret standoff in Nova Prospekt.
Unlocked 29 Jun, 2011 @ 10:13am

Radiation Levels Detected

Get through the toxic tunnel under City 17 in Half-Life 2.
Unlocked 24 Jul, 2010 @ 3:42am

Plaza Defender

Survive the generator plaza standoff in chapter Anticitizen One.
Unlocked 24 Jul, 2010 @ 7:22am

Counter-Sniper

Kill all of the snipers in City 17.
Unlocked 27 Jul, 2010 @ 3:14am

Fight the Power

Shut down the supression device by disabling its generators.
Unlocked 27 Jul, 2010 @ 4:55am

Giant Killer

Survive the rooftop strider battle in the ruins of City 17.
Unlocked 27 Jul, 2010 @ 6:07am

Atomizer

Disintegrate 15 soldiers by throwing them into a Combine ball field.
Unlocked 27 Jul, 2010 @ 6:26am

Singularity Collapse

Destroy the Citadel's reactor core.
Unlocked 27 Jul, 2010 @ 7:02am

Hack Attack!

Kill five enemies with a Manhack.
Unlocked 24 Jul, 2010 @ 3:21am

Watch Your Head!

Make it to the bottom of the Citadel's main elevator shaft in one piece.
Unlocked 15 Nov @ 5:03pm

Containment

Contain the Citadel core.
Unlocked 15 Nov @ 5:03pm

Pacifist

Contain the Citadel core without killing any stalkers.
Unlocked 15 Nov @ 5:03pm

Car Crusher

Use the cars to squash 15 antlions in Episode One.
Unlocked 15 Nov @ 5:03pm

Elevator Action

Survive long enough to get on the parking garage elevator.
Unlocked 15 Nov @ 5:03pm

Live Bait

Help Alyx snipe 30 enemies in Episode One.
Unlocked 15 Nov @ 5:03pm

Attica!

Destroy the gunship in the hospital attic.
Unlocked 15 Nov @ 5:03pm

Citizen Escort

Don't let any citizens die when escorting them to the escape train.
Unlocked 15 Nov @ 5:03pm

Escape From City 17

Escape City 17 with Alyx.
Unlocked 15 Nov @ 5:03pm

Think Fast!

Kill an Elite Soldier with his own energy ball.
Unlocked 15 Nov @ 5:03pm

Zombie-que

Use flares to light 15 zombies on fire.
Unlocked 15 Nov @ 5:03pm

Acid Reflex

Kill an acid antlion worker.
Unlocked 15 Nov @ 5:03pm

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 15 Nov @ 5:03pm

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 15 Nov @ 5:03pm

Hit and Run

Run over 20 enemies with the car in Episode Two.
Unlocked 15 Nov @ 5:03pm

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 15 Nov @ 5:03pm

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.
Unlocked 15 Nov @ 5:03pm

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 15 Nov @ 5:03pm

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 15 Nov @ 5:03pm

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked 15 Nov @ 5:03pm

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 15 Nov @ 5:03pm

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 15 Nov @ 5:03pm

Little Rocket Man

Send the garden gnome into space.
Unlocked 15 Nov @ 5:03pm

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 15 Nov @ 5:03pm

Neighborhood Watch

Save all buildings outside the missile silo from destruction.
Unlocked 15 Nov @ 5:03pm

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 15 Nov @ 5:03pm

Payback

Kill a Hunter with its own flechettes.
Unlocked 15 Nov @ 5:03pm

Bone Breaker

Kill 30 enemies with thrown physics objects.
Unlocked 15 Nov @ 5:03pm

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 15 Nov @ 5:03pm

Hot Potat0wned

Kill a Combine soldier with his own grenade.
Unlocked 15 Nov @ 5:03pm

Grave Robber

Steal a Zombine's grenade.
Unlocked 15 Nov @ 5:03pm



What cat?

Break the mini-teleporter in Kleiner's lab.

Follow Freeman

Gain command of a squad of rebels in the uprising.

Lambda Locator

Find all lambda caches in Half-Life 2.

The One Free Bullet

Finish the game firing exactly one bullet. Grenade, crowbar, rocket, and Gravity Gun kills are okay!

Conservationist

Kill five enemies with the same energy ball.

Get Some Grub

Squish every antlion grub in Episode Two.

Piñata Party

Find and break every web cache in Episode Two.

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.