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

Defiant

Hit the trashcan cop with the can.

Submissive

Put the can in the trash.

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.

Vorticough

Discover the hidden singing vortigaunt cave in chapter Water Hazard.

Revenge!

Destroy the hunter-chopper in Half-Life 2.

Blast from the Past

Find the HEV Suit Charger faceplate in Eli's scrapyard.

Zero-Point Energy

Get the Gravity Gun in Black Mesa East.

Two Points

Use DOG's ball to make a basket in Eli's scrapyard.

Zombie Chopper

Play through Ravenholm using only the Gravity Gun.

Hallowed Ground

Escort Gregori safely through the church cemetery.

OSHA Violation

Kill 3 enemies using the crane.

Targetted Advertising

Pin a soldier to the billboard in chapter Highway 17.

Where Cubbage Fears to Tread

Defend Little Odessa from the gunship attack.

One Man Army

Destroy six gunships in Half-Life 2.

Keep Off the Sand!

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

Bug Hunt

Use the antlions to kill 50 enemies.

Flushed

Kill an enemy with a toilet.

Warden Freeman

Survive the second turret standoff in Nova Prospekt.

Follow Freeman

Gain command of a squad of rebels in the uprising.

Radiation Levels Detected

Get through the toxic tunnel under City 17 in Half-Life 2.
Unlocked 29 May, 2010 @ 11:11am

Plaza Defender

Survive the generator plaza standoff in chapter Anticitizen One.

Counter-Sniper

Kill all of the snipers in City 17.
Unlocked 1 Jun, 2010 @ 10:23am

Fight the Power

Shut down the supression device by disabling its generators.

Giant Killer

Survive the rooftop strider battle in the ruins of City 17.

Atomizer

Disintegrate 15 soldiers by throwing them into a Combine ball field.

Singularity Collapse

Destroy the Citadel's reactor core.
Unlocked 1 Jun, 2010 @ 7:43am

Lambda Locator

Find all lambda caches in Half-Life 2.

Hack Attack!

Kill five enemies with a Manhack.
Unlocked 20 Jun, 2010 @ 9:43am

Watch Your Head!

Make it to the bottom of the Citadel's main elevator shaft in one piece.
Unlocked 21 Nov @ 2:52pm

Containment

Contain the Citadel core.
Unlocked 21 Nov @ 3:05pm

Pacifist

Contain the Citadel core without killing any stalkers.
Unlocked 21 Nov @ 3:05pm

Car Crusher

Use the cars to squash 15 antlions in Episode One.
Unlocked 21 Nov @ 3:38pm

Elevator Action

Survive long enough to get on the parking garage elevator.
Unlocked 21 Nov @ 3:49pm

Live Bait

Help Alyx snipe 30 enemies in Episode One.
Unlocked 21 Nov @ 4:02pm

Attica!

Destroy the gunship in the hospital attic.
Unlocked 21 Nov @ 4:28pm

Citizen Escort

Don't let any citizens die when escorting them to the escape train.
Unlocked 21 Nov @ 4:56pm

Escape From City 17

Escape City 17 with Alyx.
Unlocked 21 Nov @ 5:05pm

The One Free Bullet

Finish the game firing exactly one bullet. Grenade, crowbar, rocket, and Gravity Gun kills are okay!
Unlocked 21 Nov @ 5:05pm

Conservationist

Kill five enemies with the same energy ball.
Unlocked 21 Nov @ 3:34pm

Think Fast!

Kill an Elite Soldier with his own energy ball.
Unlocked 21 Nov @ 2:53pm

Zombie-que

Use flares to light 15 zombies on fire.
Unlocked 21 Nov @ 3:49pm

Acid Reflex

Kill an acid antlion worker.
Unlocked 22 Nov @ 6:50am

Get Some Grub

Squish every antlion grub in Episode Two.
Unlocked 22 Nov @ 8:46am

Piñata Party

Find and break every web cache in Episode Two.
Unlocked 22 Nov @ 8:35am

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 22 Nov @ 7:23am

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 22 Nov @ 8:52am

Hit and Run

Run over 20 enemies with the car in Episode Two.
Unlocked 23 Nov @ 3:41am

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 23 Nov @ 2:52am

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.
Unlocked 23 Nov @ 3:20am

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 23 Nov @ 3:31am

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 23 Nov @ 4:02am

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked 23 Nov @ 4:09am

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 23 Nov @ 3:43am

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 23 Nov @ 3:57am

Little Rocket Man

Send the garden gnome into space.
Unlocked 23 Nov @ 4:17am

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 23 Nov @ 4:31am

Neighborhood Watch

Save all buildings outside the missile silo from destruction.
Unlocked 23 Nov @ 6:41am

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 23 Nov @ 6:41am

Payback

Kill a Hunter with its own flechettes.
Unlocked 23 Nov @ 2:51am

Bone Breaker

Kill 30 enemies with thrown physics objects.
Unlocked 22 Nov @ 8:01am

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 22 Nov @ 7:14am

Hot Potat0wned

Kill a Combine soldier with his own grenade.
Unlocked 23 Nov @ 3:03am

Grave Robber

Steal a Zombine's grenade.
Unlocked 22 Nov @ 7:43am

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 21 Nov @ 5:06pm