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64 of 69 (93%) achievements earned:
Personal Achievements
 

Defiant

Hit the trashcan cop with the can.
Unlocked 8 Sep, 2011 @ 2:11am

Submissive

Put the can in the trash.
Unlocked 8 Sep, 2011 @ 2:11am

Malcontent

Escape the apartment block raid.
Unlocked 8 Sep, 2011 @ 2:32am

What cat?

Break the mini-teleporter in Kleiner's lab.
Unlocked 8 Sep, 2011 @ 4:17am

Trusty Hardware

Get the crowbar.
Unlocked 8 Sep, 2011 @ 4:25am

Barnacle Bowling

Kill five barnacles with one barrel.
Unlocked 8 Sep, 2011 @ 6:40am

Anchor's Aweigh!

Get the airboat.
Unlocked 9 Sep, 2011 @ 1:28am

Heavy Weapons

Get the airboat's mounted gun.
Unlocked 9 Sep, 2011 @ 5:02am

Vorticough

Discover the hidden singing vortigaunt cave in chapter Water Hazard.
Unlocked 9 Sep, 2011 @ 5:57am

Revenge!

Destroy the hunter-chopper in Half-Life 2.
Unlocked 9 Sep, 2011 @ 5:33am

Blast from the Past

Find the HEV Suit Charger faceplate in Eli's scrapyard.
Unlocked 9 Sep, 2011 @ 6:23am

Zero-Point Energy

Get the Gravity Gun in Black Mesa East.
Unlocked 9 Sep, 2011 @ 6:23am

Two Points

Use DOG's ball to make a basket in Eli's scrapyard.
Unlocked 9 Sep, 2011 @ 6:33am

Zombie Chopper

Play through Ravenholm using only the Gravity Gun.
Unlocked 10 Sep, 2011 @ 1:08am

Hallowed Ground

Escort Gregori safely through the church cemetery.
Unlocked 10 Sep, 2011 @ 12:42am

OSHA Violation

Kill 3 enemies using the crane.
Unlocked 10 Sep, 2011 @ 3:35am

Targetted Advertising

Pin a soldier to the billboard in chapter Highway 17.
Unlocked 10 Sep, 2011 @ 3:51am

Where Cubbage Fears to Tread

Defend Little Odessa from the gunship attack.
Unlocked 10 Sep, 2011 @ 3:21am

One Man Army

Destroy six gunships in Half-Life 2.
Unlocked 12 Sep, 2011 @ 11:20pm

Keep Off the Sand!

Cross the antlion beach in chapter Sandtraps without touching the sand.
Unlocked 21 Aug @ 2:16am

Bug Hunt

Use the antlions to kill 50 enemies.
Unlocked 13 Sep, 2011 @ 12:24am

Flushed

Kill an enemy with a toilet.
Unlocked 13 Sep, 2011 @ 12:24am

Warden Freeman

Survive the second turret standoff in Nova Prospekt.
Unlocked 13 Sep, 2011 @ 3:19am

Follow Freeman

Gain command of a squad of rebels in the uprising.
Unlocked 13 Sep, 2011 @ 3:47am

Radiation Levels Detected

Get through the toxic tunnel under City 17 in Half-Life 2.
Unlocked 14 Sep, 2011 @ 2:10am

Plaza Defender

Survive the generator plaza standoff in chapter Anticitizen One.
Unlocked 14 Sep, 2011 @ 2:38am

Counter-Sniper

Kill all of the snipers in City 17.
Unlocked 10 Oct, 2011 @ 1:42am

Fight the Power

Shut down the supression device by disabling its generators.
Unlocked 15 Sep, 2011 @ 1:46am

Giant Killer

Survive the rooftop strider battle in the ruins of City 17.
Unlocked 15 Sep, 2011 @ 3:31am

Atomizer

Disintegrate 15 soldiers by throwing them into a Combine ball field.
Unlocked 15 Sep, 2011 @ 4:05am

Singularity Collapse

Destroy the Citadel's reactor core.
Unlocked 16 Sep, 2011 @ 12:46am

Lambda Locator

Find all lambda caches in Half-Life 2.
Unlocked 9 Sep @ 5:16am

Hack Attack!

Kill five enemies with a Manhack.
Unlocked 22 Nov, 2011 @ 3:35am

Watch Your Head!

Make it to the bottom of the Citadel's main elevator shaft in one piece.
Unlocked 16 Nov @ 12:58am

Containment

Contain the Citadel core.
Unlocked 16 Nov @ 12:58am

Pacifist

Contain the Citadel core without killing any stalkers.
Unlocked 16 Nov @ 12:58am

Car Crusher

Use the cars to squash 15 antlions in Episode One.
Unlocked 16 Nov @ 12:58am

Elevator Action

Survive long enough to get on the parking garage elevator.
Unlocked 16 Nov @ 12:58am

Live Bait

Help Alyx snipe 30 enemies in Episode One.
Unlocked 16 Nov @ 12:58am

Attica!

Destroy the gunship in the hospital attic.
Unlocked 16 Nov @ 12:58am

Citizen Escort

Don't let any citizens die when escorting them to the escape train.
Unlocked 16 Nov @ 12:58am

Escape From City 17

Escape City 17 with Alyx.
Unlocked 16 Nov @ 12:58am

The One Free Bullet

Finish the game firing exactly one bullet. Grenade, crowbar, rocket, and Gravity Gun kills are okay!
Unlocked 16 Nov @ 12:58am

Conservationist

Kill five enemies with the same energy ball.
Unlocked 16 Nov @ 12:58am

Think Fast!

Kill an Elite Soldier with his own energy ball.
Unlocked 16 Nov @ 12:58am

Acid Reflex

Kill an acid antlion worker.
Unlocked 16 Nov @ 12:58am

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 16 Nov @ 12:58am

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 16 Nov @ 12:58am

Hit and Run

Run over 20 enemies with the car in Episode Two.
Unlocked 16 Nov @ 12:58am

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 16 Nov @ 12:58am

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.
Unlocked 16 Nov @ 12:58am

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 16 Nov @ 12:58am

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 16 Nov @ 12:58am

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked 16 Nov @ 12:58am

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 16 Nov @ 12:58am

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 16 Nov @ 12:58am

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 16 Nov @ 12:58am

Neighborhood Watch

Save all buildings outside the missile silo from destruction.
Unlocked 16 Nov @ 12:58am

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 16 Nov @ 12:58am

Payback

Kill a Hunter with its own flechettes.
Unlocked 16 Nov @ 12:58am

Bone Breaker

Kill 30 enemies with thrown physics objects.
Unlocked 16 Nov @ 12:58am

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 16 Nov @ 12:58am

Grave Robber

Steal a Zombine's grenade.
Unlocked 16 Nov @ 12:58am

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 16 Nov @ 12:58am



Zombie-que

Use flares to light 15 zombies on fire.

Get Some Grub

Squish every antlion grub in Episode Two.

Piñata Party

Find and break every web cache in Episode Two.

Little Rocket Man

Send the garden gnome into space.

Hot Potat0wned

Kill a Combine soldier with his own grenade.