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59 of 69 (86%) achievements earned:
Personal Achievements
 

Defiant

Hit the trashcan cop with the can.
Unlocked 17 Nov @ 7:07am

Submissive

Put the can in the trash.
Unlocked 17 Nov @ 7:07am

Malcontent

Escape the apartment block raid.
Unlocked 17 Nov @ 7:15am

What cat?

Break the mini-teleporter in Kleiner's lab.
Unlocked 18 Nov @ 8:18am

Trusty Hardware

Get the crowbar.
Unlocked 17 Nov @ 7:27am

Barnacle Bowling

Kill five barnacles with one barrel.
Unlocked 17 Nov @ 7:44am

Anchor's Aweigh!

Get the airboat.
Unlocked 17 Nov @ 8:22am

Heavy Weapons

Get the airboat's mounted gun.
Unlocked 17 Nov @ 9:06am

Revenge!

Destroy the hunter-chopper in Half-Life 2.
Unlocked 17 Nov @ 9:21am

Blast from the Past

Find the HEV Suit Charger faceplate in Eli's scrapyard.
Unlocked 17 Nov @ 9:38am

Zero-Point Energy

Get the Gravity Gun in Black Mesa East.
Unlocked 17 Nov @ 9:37am

Two Points

Use DOG's ball to make a basket in Eli's scrapyard.
Unlocked 17 Nov @ 9:41am

Zombie Chopper

Play through Ravenholm using only the Gravity Gun.
Unlocked 17 Nov @ 11:21am

Hallowed Ground

Escort Gregori safely through the church cemetery.
Unlocked 17 Nov @ 11:11am

OSHA Violation

Kill 3 enemies using the crane.
Unlocked 17 Nov @ 11:59am

Targetted Advertising

Pin a soldier to the billboard in chapter Highway 17.
Unlocked 17 Nov @ 12:12pm

Where Cubbage Fears to Tread

Defend Little Odessa from the gunship attack.
Unlocked 17 Nov @ 11:51am

One Man Army

Destroy six gunships in Half-Life 2.
Unlocked 18 Nov @ 6:56am

Bug Hunt

Use the antlions to kill 50 enemies.
Unlocked 18 Nov @ 2:32am

Flushed

Kill an enemy with a toilet.
Unlocked 18 Nov @ 8:16am

Warden Freeman

Survive the second turret standoff in Nova Prospekt.
Unlocked 18 Nov @ 3:34am

Follow Freeman

Gain command of a squad of rebels in the uprising.
Unlocked 18 Nov @ 5:01am

Radiation Levels Detected

Get through the toxic tunnel under City 17 in Half-Life 2.
Unlocked 18 Nov @ 5:32am

Plaza Defender

Survive the generator plaza standoff in chapter Anticitizen One.
Unlocked 18 Nov @ 5:57am

Counter-Sniper

Kill all of the snipers in City 17.
Unlocked 18 Nov @ 6:28am

Fight the Power

Shut down the supression device by disabling its generators.
Unlocked 18 Nov @ 6:51am

Giant Killer

Survive the rooftop strider battle in the ruins of City 17.
Unlocked 18 Nov @ 7:25am

Atomizer

Disintegrate 15 soldiers by throwing them into a Combine ball field.
Unlocked 18 Nov @ 7:40am

Singularity Collapse

Destroy the Citadel's reactor core.
Unlocked 18 Nov @ 8:07am

Hack Attack!

Kill five enemies with a Manhack.
Unlocked 18 Nov @ 3:21am

Watch Your Head!

Make it to the bottom of the Citadel's main elevator shaft in one piece.
Unlocked 18 Nov @ 9:15am

Containment

Contain the Citadel core.
Unlocked 18 Nov @ 9:28am

Pacifist

Contain the Citadel core without killing any stalkers.
Unlocked 18 Nov @ 9:28am

Car Crusher

Use the cars to squash 15 antlions in Episode One.
Unlocked 18 Nov @ 10:21am

Elevator Action

Survive long enough to get on the parking garage elevator.
Unlocked 18 Nov @ 10:03am

Live Bait

Help Alyx snipe 30 enemies in Episode One.
Unlocked 18 Nov @ 10:21am

Attica!

Destroy the gunship in the hospital attic.
Unlocked 18 Nov @ 11:08am

Citizen Escort

Don't let any citizens die when escorting them to the escape train.
Unlocked 25 Nov @ 12:26am

Escape From City 17

Escape City 17 with Alyx.
Unlocked 25 Nov @ 12:37am

The One Free Bullet

Finish the game firing exactly one bullet. Grenade, crowbar, rocket, and Gravity Gun kills are okay!
Unlocked 25 Nov @ 12:37am

Think Fast!

Kill an Elite Soldier with his own energy ball.
Unlocked 18 Nov @ 9:15am

Acid Reflex

Kill an acid antlion worker.
Unlocked 25 Nov @ 1:09am

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 25 Nov @ 3:49am

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 25 Nov @ 6:06am

Hit and Run

Run over 20 enemies with the car in Episode Two.
Unlocked 25 Nov @ 8:04am

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 25 Nov @ 6:50am

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.
Unlocked 25 Nov @ 7:49am

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 25 Nov @ 7:38am

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 25 Nov @ 8:44am

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked 25 Nov @ 8:52am

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 25 Nov @ 8:08am

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 25 Nov @ 8:38am

Little Rocket Man

Send the garden gnome into space.
Unlocked 25 Nov @ 8:58am

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 25 Nov @ 9:16am

Bone Breaker

Kill 30 enemies with thrown physics objects.
Unlocked 25 Nov @ 4:18am

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 25 Nov @ 3:40am

Hot Potat0wned

Kill a Combine soldier with his own grenade.
Unlocked 25 Nov @ 9:10am

Grave Robber

Steal a Zombine's grenade.
Unlocked 25 Nov @ 12:51am

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 25 Nov @ 12:40am



Vorticough

Discover the hidden singing vortigaunt cave in chapter Water Hazard.

Keep Off the Sand!

Cross the antlion beach in chapter Sandtraps without touching the sand.

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.

Neighborhood Watch

Save all buildings outside the missile silo from destruction.

Defense of the Armament

Save the missile silo from the Combine offensive.

Payback

Kill a Hunter with its own flechettes.