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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.
Unlocked 26 May, 2010 @ 2:37pm

Heavy Weapons

Get the airboat's mounted gun.
Unlocked 26 Nov, 2010 @ 3:04pm

Vorticough

Discover the hidden singing vortigaunt cave in chapter Water Hazard.
Unlocked 26 May, 2010 @ 3:47pm

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.

Plaza Defender

Survive the generator plaza standoff in chapter Anticitizen One.

Counter-Sniper

Kill all of the snipers in City 17.

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.
Unlocked 27 May, 2010 @ 2:58pm

Singularity Collapse

Destroy the Citadel's reactor core.
Unlocked 27 May, 2010 @ 3:13pm

Lambda Locator

Find all lambda caches in Half-Life 2.

Hack Attack!

Kill five enemies with a Manhack.

Watch Your Head!

Make it to the bottom of the Citadel's main elevator shaft in one piece.
Unlocked 15 Nov @ 2:57pm

Containment

Contain the Citadel core.
Unlocked 15 Nov @ 2:57pm

Pacifist

Contain the Citadel core without killing any stalkers.
Unlocked 15 Nov @ 2:57pm

Car Crusher

Use the cars to squash 15 antlions in Episode One.
Unlocked 15 Nov @ 2:57pm

Elevator Action

Survive long enough to get on the parking garage elevator.
Unlocked 15 Nov @ 2:57pm

Live Bait

Help Alyx snipe 30 enemies in Episode One.
Unlocked 15 Nov @ 2:57pm

Attica!

Destroy the gunship in the hospital attic.
Unlocked 15 Nov @ 2:57pm

Citizen Escort

Don't let any citizens die when escorting them to the escape train.
Unlocked 15 Nov @ 2:57pm

Escape From City 17

Escape City 17 with Alyx.
Unlocked 15 Nov @ 2:57pm

The One Free Bullet

Finish the game firing exactly one bullet. Grenade, crowbar, rocket, and Gravity Gun kills are okay!
Unlocked 16 Nov @ 1:12am

Conservationist

Kill five enemies with the same energy ball.
Unlocked 15 Nov @ 2:57pm

Think Fast!

Kill an Elite Soldier with his own energy ball.
Unlocked 15 Nov @ 2:57pm

Zombie-que

Use flares to light 15 zombies on fire.
Unlocked 15 Nov @ 2:57pm

Acid Reflex

Kill an acid antlion worker.
Unlocked 15 Nov @ 2:57pm

Get Some Grub

Squish every antlion grub in Episode Two.
Unlocked 15 Nov @ 2:57pm

Piñata Party

Find and break every web cache in Episode Two.
Unlocked 15 Nov @ 2:57pm

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 15 Nov @ 2:57pm

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 15 Nov @ 2:57pm

Hit and Run

Run over 20 enemies with the car in Episode Two.
Unlocked 15 Nov @ 2:57pm

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 15 Nov @ 2:57pm

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.
Unlocked 15 Nov @ 2:57pm

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 15 Nov @ 2:57pm

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 15 Nov @ 2:57pm

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked 15 Nov @ 2:57pm

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 15 Nov @ 2:57pm

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 15 Nov @ 2:57pm

Little Rocket Man

Send the garden gnome into space.
Unlocked 15 Nov @ 2:57pm

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 15 Nov @ 2:57pm

Neighborhood Watch

Save all buildings outside the missile silo from destruction.
Unlocked 15 Nov @ 2:57pm

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 15 Nov @ 2:57pm

Payback

Kill a Hunter with its own flechettes.
Unlocked 15 Nov @ 2:57pm

Bone Breaker

Kill 30 enemies with thrown physics objects.
Unlocked 15 Nov @ 2:57pm

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 15 Nov @ 2:57pm

Hot Potat0wned

Kill a Combine soldier with his own grenade.
Unlocked 15 Nov @ 2:57pm

Grave Robber

Steal a Zombine's grenade.
Unlocked 15 Nov @ 2:57pm

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 @ 2:57pm