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

Defiant

Hit the trashcan cop with the can.
Unlocked 24 Nov @ 12:23pm

Submissive

Put the can in the trash.
Unlocked 15 Nov @ 4:54pm

Malcontent

Escape the apartment block raid.
Unlocked 15 Nov @ 5:05pm

What cat?

Break the mini-teleporter in Kleiner's lab.
Unlocked 24 Nov @ 12:18pm

Trusty Hardware

Get the crowbar.
Unlocked 15 Nov @ 5:23pm

Barnacle Bowling

Kill five barnacles with one barrel.
Unlocked 15 Nov @ 5:51pm

Anchor's Aweigh!

Get the airboat.
Unlocked 15 Nov @ 9:35pm

Heavy Weapons

Get the airboat's mounted gun.
Unlocked 16 Nov @ 5:21pm

Vorticough

Discover the hidden singing vortigaunt cave in chapter Water Hazard.
Unlocked 24 Nov @ 2:01pm

Revenge!

Destroy the hunter-chopper in Half-Life 2.
Unlocked 16 Nov @ 5:46pm

Blast from the Past

Find the HEV Suit Charger faceplate in Eli's scrapyard.
Unlocked 16 Nov @ 6:14pm

Zero-Point Energy

Get the Gravity Gun in Black Mesa East.
Unlocked 16 Nov @ 6:13pm

Two Points

Use DOG's ball to make a basket in Eli's scrapyard.
Unlocked 16 Nov @ 6:17pm

Zombie Chopper

Play through Ravenholm using only the Gravity Gun.
Unlocked 26 Nov @ 11:02am

Hallowed Ground

Escort Gregori safely through the church cemetery.
Unlocked 17 Nov @ 6:51pm

OSHA Violation

Kill 3 enemies using the crane.
Unlocked 18 Nov @ 8:06am

Targetted Advertising

Pin a soldier to the billboard in chapter Highway 17.
Unlocked 18 Nov @ 6:59pm

Where Cubbage Fears to Tread

Defend Little Odessa from the gunship attack.
Unlocked 18 Nov @ 7:58am

One Man Army

Destroy six gunships in Half-Life 2.
Unlocked 20 Nov @ 6:13pm

Keep Off the Sand!

Cross the antlion beach in chapter Sandtraps without touching the sand.
Unlocked 24 Nov @ 2:25pm

Bug Hunt

Use the antlions to kill 50 enemies.
Unlocked 19 Nov @ 8:19pm

Flushed

Kill an enemy with a toilet.
Unlocked 20 Nov @ 6:19pm

Warden Freeman

Survive the second turret standoff in Nova Prospekt.
Unlocked 23 Nov @ 9:29am

Follow Freeman

Gain command of a squad of rebels in the uprising.
Unlocked 24 Nov @ 10:00am

Radiation Levels Detected

Get through the toxic tunnel under City 17 in Half-Life 2.
Unlocked 24 Nov @ 10:34am

Plaza Defender

Survive the generator plaza standoff in chapter Anticitizen One.
Unlocked 24 Nov @ 11:15am

Counter-Sniper

Kill all of the snipers in City 17.
Unlocked 26 Nov @ 2:59pm

Fight the Power

Shut down the supression device by disabling its generators.
Unlocked 24 Nov @ 5:39pm

Giant Killer

Survive the rooftop strider battle in the ruins of City 17.
Unlocked 24 Nov @ 6:12pm

Atomizer

Disintegrate 15 soldiers by throwing them into a Combine ball field.
Unlocked 24 Nov @ 6:31pm

Singularity Collapse

Destroy the Citadel's reactor core.
Unlocked 24 Nov @ 6:59pm

Lambda Locator

Find all lambda caches in Half-Life 2.
Unlocked 26 Nov @ 12:57pm

Hack Attack!

Kill five enemies with a Manhack.
Unlocked 24 Nov @ 6:34pm

Watch Your Head!

Make it to the bottom of the Citadel's main elevator shaft in one piece.
Unlocked 27 Nov @ 11:39am

Containment

Contain the Citadel core.
Unlocked 27 Nov @ 12:08pm

Pacifist

Contain the Citadel core without killing any stalkers.
Unlocked 27 Nov @ 12:08pm

Car Crusher

Use the cars to squash 15 antlions in Episode One.
Unlocked 27 Nov @ 12:36pm

Elevator Action

Survive long enough to get on the parking garage elevator.
Unlocked 27 Nov @ 1:07pm

Live Bait

Help Alyx snipe 30 enemies in Episode One.
Unlocked 27 Nov @ 1:29pm

Attica!

Destroy the gunship in the hospital attic.
Unlocked 27 Nov @ 3:52pm

Citizen Escort

Don't let any citizens die when escorting them to the escape train.
Unlocked 27 Nov @ 4:30pm

Escape From City 17

Escape City 17 with Alyx.
Unlocked 27 Nov @ 5:19pm

The One Free Bullet

Finish the game firing exactly one bullet. Grenade, crowbar, rocket, and Gravity Gun kills are okay!
Unlocked 27 Nov @ 5:19pm

Conservationist

Kill five enemies with the same energy ball.
Unlocked 27 Nov @ 11:43am

Think Fast!

Kill an Elite Soldier with his own energy ball.
Unlocked 27 Nov @ 11:41am

Zombie-que

Use flares to light 15 zombies on fire.
Unlocked 27 Nov @ 1:05pm

Acid Reflex

Kill an acid antlion worker.
Unlocked 29 Nov @ 10:16am

Get Some Grub

Squish every antlion grub in Episode Two.
Unlocked 30 Nov @ 8:21am

Piñata Party

Find and break every web cache in Episode Two.
Unlocked 30 Nov @ 8:16am

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 29 Nov @ 5:27pm

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 30 Nov @ 8:36pm

Hit and Run

Run over 20 enemies with the car in Episode Two.
Unlocked 1 Dec @ 6:09pm

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 1 Dec @ 7:56am

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.
Unlocked 1 Dec @ 8:18am

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 1 Dec @ 6:07pm

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 1 Dec @ 6:34pm

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked 1 Dec @ 6:45pm

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 1 Dec @ 6:10pm

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 1 Dec @ 6:28pm

Little Rocket Man

Send the garden gnome into space.
Unlocked 1 Dec @ 8:42pm

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 1 Dec @ 7:14pm

Neighborhood Watch

Save all buildings outside the missile silo from destruction.
Unlocked 1 Dec @ 8:27pm

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 1 Dec @ 8:27pm

Payback

Kill a Hunter with its own flechettes.
Unlocked 1 Dec @ 7:56am

Bone Breaker

Kill 30 enemies with thrown physics objects.
Unlocked 29 Nov @ 7:16pm

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 29 Nov @ 4:59pm

Hot Potat0wned

Kill a Combine soldier with his own grenade.
Unlocked 1 Dec @ 8:48am

Grave Robber

Steal a Zombine's grenade.
Unlocked 29 Nov @ 5:56pm

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 26 Nov @ 12:59pm