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55 of 69 (80%) achievements earned:
Personal Achievements
 

Defiant

Hit the trashcan cop with the can.
Unlocked 14 May, 2012 @ 5:51am

Submissive

Put the can in the trash.
Unlocked 17 May, 2012 @ 6:00am

Malcontent

Escape the apartment block raid.
Unlocked 14 May, 2012 @ 6:08am

What cat?

Break the mini-teleporter in Kleiner's lab.
Unlocked 14 May, 2012 @ 6:18am

Trusty Hardware

Get the crowbar.
Unlocked 14 May, 2012 @ 6:23am

Barnacle Bowling

Kill five barnacles with one barrel.
Unlocked 15 May, 2012 @ 12:26am

Anchor's Aweigh!

Get the airboat.
Unlocked 15 May, 2012 @ 3:15am

Heavy Weapons

Get the airboat's mounted gun.
Unlocked 15 May, 2012 @ 4:08am

Vorticough

Discover the hidden singing vortigaunt cave in chapter Water Hazard.
Unlocked 18 May, 2012 @ 7:11am

Revenge!

Destroy the hunter-chopper in Half-Life 2.
Unlocked 15 May, 2012 @ 4:28am

Blast from the Past

Find the HEV Suit Charger faceplate in Eli's scrapyard.
Unlocked 15 May, 2012 @ 4:51am

Zero-Point Energy

Get the Gravity Gun in Black Mesa East.
Unlocked 15 May, 2012 @ 4:51am

Two Points

Use DOG's ball to make a basket in Eli's scrapyard.
Unlocked 15 May, 2012 @ 4:55am

Zombie Chopper

Play through Ravenholm using only the Gravity Gun.
Unlocked 16 May, 2012 @ 3:53am

Hallowed Ground

Escort Gregori safely through the church cemetery.
Unlocked 16 May, 2012 @ 3:38am

OSHA Violation

Kill 3 enemies using the crane.
Unlocked 16 May, 2012 @ 4:42am

Targetted Advertising

Pin a soldier to the billboard in chapter Highway 17.
Unlocked 16 May, 2012 @ 5:03am

Where Cubbage Fears to Tread

Defend Little Odessa from the gunship attack.
Unlocked 16 May, 2012 @ 4:28am

One Man Army

Destroy six gunships in Half-Life 2.
Unlocked 16 May, 2012 @ 7:13am

Keep Off the Sand!

Cross the antlion beach in chapter Sandtraps without touching the sand.
Unlocked 16 May, 2012 @ 6:46am

Bug Hunt

Use the antlions to kill 50 enemies.
Unlocked 16 May, 2012 @ 7:10am

Flushed

Kill an enemy with a toilet.
Unlocked 16 May, 2012 @ 10:18pm

Warden Freeman

Survive the second turret standoff in Nova Prospekt.
Unlocked 17 May, 2012 @ 12:40am

Follow Freeman

Gain command of a squad of rebels in the uprising.
Unlocked 17 May, 2012 @ 1:13am

Radiation Levels Detected

Get through the toxic tunnel under City 17 in Half-Life 2.
Unlocked 17 May, 2012 @ 2:00am

Plaza Defender

Survive the generator plaza standoff in chapter Anticitizen One.
Unlocked 17 May, 2012 @ 3:10am

Counter-Sniper

Kill all of the snipers in City 17.
Unlocked 17 May, 2012 @ 3:46am

Fight the Power

Shut down the supression device by disabling its generators.
Unlocked 17 May, 2012 @ 4:17am

Giant Killer

Survive the rooftop strider battle in the ruins of City 17.
Unlocked 17 May, 2012 @ 4:50am

Atomizer

Disintegrate 15 soldiers by throwing them into a Combine ball field.
Unlocked 17 May, 2012 @ 5:08am

Singularity Collapse

Destroy the Citadel's reactor core.
Unlocked 17 May, 2012 @ 5:46am

Hack Attack!

Kill five enemies with a Manhack.
Unlocked 17 May, 2012 @ 12:39am

Watch Your Head!

Make it to the bottom of the Citadel's main elevator shaft in one piece.
Unlocked 16 Nov @ 2:17am

Containment

Contain the Citadel core.
Unlocked 16 Nov @ 2:17am

Pacifist

Contain the Citadel core without killing any stalkers.
Unlocked 16 Nov @ 2:17am

Car Crusher

Use the cars to squash 15 antlions in Episode One.
Unlocked 16 Nov @ 2:17am

Elevator Action

Survive long enough to get on the parking garage elevator.
Unlocked 16 Nov @ 2:17am

Live Bait

Help Alyx snipe 30 enemies in Episode One.
Unlocked 16 Nov @ 2:17am

Attica!

Destroy the gunship in the hospital attic.
Unlocked 16 Nov @ 2:17am

Citizen Escort

Don't let any citizens die when escorting them to the escape train.
Unlocked 16 Nov @ 2:17am

Escape From City 17

Escape City 17 with Alyx.
Unlocked 16 Nov @ 2:17am

The One Free Bullet

Finish the game firing exactly one bullet. Grenade, crowbar, rocket, and Gravity Gun kills are okay!
Unlocked 16 Nov @ 2:17am

Think Fast!

Kill an Elite Soldier with his own energy ball.
Unlocked 16 Nov @ 2:17am

Acid Reflex

Kill an acid antlion worker.
Unlocked 16 Nov @ 2:00am

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 16 Nov @ 2:00am

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 16 Nov @ 2:00am

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 16 Nov @ 2:00am

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 16 Nov @ 2:00am

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 16 Nov @ 2:00am

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 16 Nov @ 2:00am

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 16 Nov @ 2:00am

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 16 Nov @ 2:00am

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 16 Nov @ 2:00am

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 16 Nov @ 2:00am

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 @ 2:09am



Lambda Locator

Find all lambda caches in Half-Life 2.

Conservationist

Kill five enemies with the same energy ball.

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.

Hit and Run

Run over 20 enemies with the car in Episode Two.

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.

Pedal to the Metal

Beat DOG in a race to the White Forest base.

Little Rocket Man

Send the garden gnome into space.

Neighborhood Watch

Save all buildings outside the missile silo from destruction.

Payback

Kill a Hunter with its own flechettes.

Bone Breaker

Kill 30 enemies with thrown physics objects.

Hot Potat0wned

Kill a Combine soldier with his own grenade.

Grave Robber

Steal a Zombine's grenade.