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

Defiant

Hit the trashcan cop with the can.
Unlocked 17 Dec @ 4:11pm

Submissive

Put the can in the trash.
Unlocked 7 Dec @ 6:56pm

Malcontent

Escape the apartment block raid.
Unlocked 7 Dec @ 7:14pm

What cat?

Break the mini-teleporter in Kleiner's lab.
Unlocked 7 Dec @ 7:28pm

Trusty Hardware

Get the crowbar.
Unlocked 7 Dec @ 7:35pm

Barnacle Bowling

Kill five barnacles with one barrel.
Unlocked 7 Dec @ 8:02pm

Anchor's Aweigh!

Get the airboat.
Unlocked 7 Dec @ 8:41pm

Heavy Weapons

Get the airboat's mounted gun.
Unlocked 9 Dec @ 7:50pm

Vorticough

Discover the hidden singing vortigaunt cave in chapter Water Hazard.
Unlocked 9 Dec @ 8:12pm

Revenge!

Destroy the hunter-chopper in Half-Life 2.
Unlocked 9 Dec @ 8:06pm

Blast from the Past

Find the HEV Suit Charger faceplate in Eli's scrapyard.
Unlocked 9 Dec @ 8:50pm

Zero-Point Energy

Get the Gravity Gun in Black Mesa East.
Unlocked 9 Dec @ 8:49pm

Two Points

Use DOG's ball to make a basket in Eli's scrapyard.
Unlocked 9 Dec @ 8:54pm

Zombie Chopper

Play through Ravenholm using only the Gravity Gun.
Unlocked 11 Dec @ 8:14pm

Hallowed Ground

Escort Gregori safely through the church cemetery.
Unlocked 11 Dec @ 8:08pm

OSHA Violation

Kill 3 enemies using the crane.
Unlocked 11 Dec @ 8:50pm

Targetted Advertising

Pin a soldier to the billboard in chapter Highway 17.
Unlocked 13 Dec @ 7:03pm

Where Cubbage Fears to Tread

Defend Little Odessa from the gunship attack.
Unlocked 11 Dec @ 8:44pm

One Man Army

Destroy six gunships in Half-Life 2.
Unlocked 16 Dec @ 8:17pm

Keep Off the Sand!

Cross the antlion beach in chapter Sandtraps without touching the sand.
Unlocked 16 Dec @ 6:55pm

Bug Hunt

Use the antlions to kill 50 enemies.
Unlocked 16 Dec @ 8:05pm

Flushed

Kill an enemy with a toilet.
Unlocked 16 Dec @ 8:25pm

Warden Freeman

Survive the second turret standoff in Nova Prospekt.
Unlocked 17 Dec @ 9:41am

Follow Freeman

Gain command of a squad of rebels in the uprising.
Unlocked 17 Dec @ 10:04am

Radiation Levels Detected

Get through the toxic tunnel under City 17 in Half-Life 2.
Unlocked 17 Dec @ 11:52am

Plaza Defender

Survive the generator plaza standoff in chapter Anticitizen One.
Unlocked 17 Dec @ 12:22pm

Counter-Sniper

Kill all of the snipers in City 17.
Unlocked 17 Dec @ 1:18pm

Fight the Power

Shut down the supression device by disabling its generators.
Unlocked 17 Dec @ 1:51pm

Giant Killer

Survive the rooftop strider battle in the ruins of City 17.
Unlocked 17 Dec @ 3:07pm

Atomizer

Disintegrate 15 soldiers by throwing them into a Combine ball field.
Unlocked 17 Dec @ 3:27pm

Singularity Collapse

Destroy the Citadel's reactor core.
Unlocked 17 Dec @ 3:58pm

Lambda Locator

Find all lambda caches in Half-Life 2.
Unlocked 17 Dec @ 2:46pm

Hack Attack!

Kill five enemies with a Manhack.
Unlocked 16 Dec @ 8:52pm

Watch Your Head!

Make it to the bottom of the Citadel's main elevator shaft in one piece.
Unlocked 18 Dec @ 9:21pm

Containment

Contain the Citadel core.
Unlocked 18 Dec @ 9:41pm

Pacifist

Contain the Citadel core without killing any stalkers.
Unlocked 18 Dec @ 9:41pm

Car Crusher

Use the cars to squash 15 antlions in Episode One.
Unlocked 19 Dec @ 5:52pm

Elevator Action

Survive long enough to get on the parking garage elevator.
Unlocked 19 Dec @ 6:22pm

Live Bait

Help Alyx snipe 30 enemies in Episode One.
Unlocked 19 Dec @ 6:45pm

Attica!

Destroy the gunship in the hospital attic.
Unlocked 19 Dec @ 7:19pm

Citizen Escort

Don't let any citizens die when escorting them to the escape train.
Unlocked 19 Dec @ 7:57pm

Escape From City 17

Escape City 17 with Alyx.
Unlocked 19 Dec @ 8:06pm

The One Free Bullet

Finish the game firing exactly one bullet. Grenade, crowbar, rocket, and Gravity Gun kills are okay!
Unlocked 19 Dec @ 8:06pm

Conservationist

Kill five enemies with the same energy ball.
Unlocked 18 Dec @ 9:24pm

Think Fast!

Kill an Elite Soldier with his own energy ball.
Unlocked 18 Dec @ 9:11pm

Zombie-que

Use flares to light 15 zombies on fire.
Unlocked 19 Dec @ 6:20pm

Acid Reflex

Kill an acid antlion worker.
Unlocked 20 Dec @ 6:39pm

Get Some Grub

Squish every antlion grub in Episode Two.
Unlocked 21 Dec @ 9:09pm

Piñata Party

Find and break every web cache in Episode Two.
Unlocked 21 Dec @ 9:02pm

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 21 Dec @ 7:10pm

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 22 Dec @ 12:39pm

Hit and Run

Run over 20 enemies with the car in Episode Two.
Unlocked 22 Dec @ 3:48pm

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 22 Dec @ 1:48pm

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.
Unlocked 22 Dec @ 3:24pm

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 22 Dec @ 3:41pm

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 22 Dec @ 4:17pm

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked 22 Dec @ 4:23pm

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 22 Dec @ 3:50pm

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 22 Dec @ 4:08pm

Little Rocket Man

Send the garden gnome into space.
Unlocked 22 Dec @ 4:30pm

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 22 Dec @ 4:50pm

Neighborhood Watch

Save all buildings outside the missile silo from destruction.
Unlocked 22 Dec @ 5:50pm

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 22 Dec @ 5:50pm

Payback

Kill a Hunter with its own flechettes.
Unlocked 22 Dec @ 1:48pm

Bone Breaker

Kill 30 enemies with thrown physics objects.
Unlocked 21 Dec @ 7:42pm

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 21 Dec @ 6:58pm

Hot Potat0wned

Kill a Combine soldier with his own grenade.
Unlocked 22 Dec @ 1:56pm

Grave Robber

Steal a Zombine's grenade.
Unlocked 20 Dec @ 6:03pm

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 15 Nov @ 3:49pm