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58 of 69 (84%) achievements earned:
Personal Achievements
 

Defiant

Hit the trashcan cop with the can.

Submissive

Put the can in the trash.
Unlocked 16 Nov @ 6:37am

Malcontent

Escape the apartment block raid.

What cat?

Break the mini-teleporter in Kleiner's lab.

Trusty Hardware

Get the crowbar.

Barnacle Bowling

Kill five barnacles with one barrel.

Anchor's Aweigh!

Get the airboat.

Heavy Weapons

Get the airboat's mounted gun.
Unlocked 30 May, 2010 @ 5:18am

Vorticough

Discover the hidden singing vortigaunt cave in chapter Water Hazard.
Unlocked 16 Nov @ 1:42pm

Revenge!

Destroy the hunter-chopper in Half-Life 2.
Unlocked 18 May, 2013 @ 3:00am

Blast from the Past

Find the HEV Suit Charger faceplate in Eli's scrapyard.
Unlocked 18 May, 2013 @ 3:12am

Zero-Point Energy

Get the Gravity Gun in Black Mesa East.
Unlocked 18 May, 2013 @ 3:13am

Two Points

Use DOG's ball to make a basket in Eli's scrapyard.
Unlocked 16 Nov @ 2:02pm

Zombie Chopper

Play through Ravenholm using only the Gravity Gun.
Unlocked 16 Nov @ 2:58pm

Hallowed Ground

Escort Gregori safely through the church cemetery.
Unlocked 16 Nov @ 2:52pm

OSHA Violation

Kill 3 enemies using the crane.
Unlocked 17 Nov @ 3:14am

Targetted Advertising

Pin a soldier to the billboard in chapter Highway 17.
Unlocked 17 Nov @ 3:33am

Where Cubbage Fears to Tread

Defend Little Odessa from the gunship attack.
Unlocked 17 Nov @ 3:10am

One Man Army

Destroy six gunships in Half-Life 2.
Unlocked 17 Nov @ 6:57am

Keep Off the Sand!

Cross the antlion beach in chapter Sandtraps without touching the sand.
Unlocked 17 Nov @ 6:25am

Bug Hunt

Use the antlions to kill 50 enemies.
Unlocked 17 Nov @ 6:42am

Flushed

Kill an enemy with a toilet.
Unlocked 17 Nov @ 7:00am

Warden Freeman

Survive the second turret standoff in Nova Prospekt.
Unlocked 17 Nov @ 8:06am

Follow Freeman

Gain command of a squad of rebels in the uprising.
Unlocked 17 Nov @ 8:29am

Radiation Levels Detected

Get through the toxic tunnel under City 17 in Half-Life 2.
Unlocked 17 Nov @ 11:15am

Plaza Defender

Survive the generator plaza standoff in chapter Anticitizen One.
Unlocked 17 Nov @ 11:35am

Counter-Sniper

Kill all of the snipers in City 17.
Unlocked 17 Nov @ 12:01pm

Fight the Power

Shut down the supression device by disabling its generators.
Unlocked 17 Nov @ 12:23pm

Giant Killer

Survive the rooftop strider battle in the ruins of City 17.
Unlocked 17 Nov @ 1:01pm

Atomizer

Disintegrate 15 soldiers by throwing them into a Combine ball field.
Unlocked 17 Nov @ 1:22pm

Singularity Collapse

Destroy the Citadel's reactor core.
Unlocked 17 Nov @ 1:45pm

Hack Attack!

Kill five enemies with a Manhack.
Unlocked 17 Nov @ 11:11am

Watch Your Head!

Make it to the bottom of the Citadel's main elevator shaft in one piece.
Unlocked 18 Nov @ 5:30am

Containment

Contain the Citadel core.
Unlocked 18 Nov @ 5:47am

Pacifist

Contain the Citadel core without killing any stalkers.
Unlocked 18 Nov @ 5:47am

Car Crusher

Use the cars to squash 15 antlions in Episode One.
Unlocked 18 Nov @ 8:25am

Elevator Action

Survive long enough to get on the parking garage elevator.
Unlocked 18 Nov @ 8:39am

Live Bait

Help Alyx snipe 30 enemies in Episode One.
Unlocked 18 Nov @ 11:57am

Attica!

Destroy the gunship in the hospital attic.
Unlocked 18 Nov @ 12:30pm

Citizen Escort

Don't let any citizens die when escorting them to the escape train.
Unlocked 18 Nov @ 1:03pm

Escape From City 17

Escape City 17 with Alyx.
Unlocked 16 Nov @ 6:22am

The One Free Bullet

Finish the game firing exactly one bullet. Grenade, crowbar, rocket, and Gravity Gun kills are okay!
Unlocked 18 Nov @ 1:17pm

Conservationist

Kill five enemies with the same energy ball.
Unlocked 18 Nov @ 5:38am

Think Fast!

Kill an Elite Soldier with his own energy ball.
Unlocked 18 Nov @ 12:36pm

Acid Reflex

Kill an acid antlion worker.
Unlocked 16 Nov @ 6:22am

Piñata Party

Find and break every web cache in Episode Two.
Unlocked 24 Nov @ 11:20am

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 16 Nov @ 6:22am

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 16 Nov @ 6:22am

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 16 Nov @ 6:22am

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 16 Nov @ 6:22am

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 16 Nov @ 6:22am

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 16 Nov @ 6:22am

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 16 Nov @ 6:22am

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 16 Nov @ 6:22am

Bone Breaker

Kill 30 enemies with thrown physics objects.
Unlocked 24 Nov @ 7:48am

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 16 Nov @ 6:22am

Grave Robber

Steal a Zombine's grenade.
Unlocked 24 Nov @ 8:09am

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 @ 6:23am



Lambda Locator

Find all lambda caches in Half-Life 2.

Zombie-que

Use flares to light 15 zombies on fire.

Get Some Grub

Squish every antlion grub 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.

Cache Checker

Find every radar cache in chapter Under The Radar.

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.

Hot Potat0wned

Kill a Combine soldier with his own grenade.