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36 of 69 (52%) achievements earned:
Personal Achievements
 

Defiant

Hit the trashcan cop with the can.
Unlocked 16 Nov @ 4:52am

Submissive

Put the can in the trash.
Unlocked 16 Nov @ 4:53am

Malcontent

Escape the apartment block raid.
Unlocked 16 Nov @ 4:56am

What cat?

Break the mini-teleporter in Kleiner's lab.
Unlocked 16 Nov @ 5:01am

Trusty Hardware

Get the crowbar.
Unlocked 16 Nov @ 5:07am

Barnacle Bowling

Kill five barnacles with one barrel.
Unlocked 16 Nov @ 5:42am

Anchor's Aweigh!

Get the airboat.
Unlocked 17 Nov @ 2:37am

Heavy Weapons

Get the airboat's mounted gun.
Unlocked 17 Nov @ 4:35am

Vorticough

Discover the hidden singing vortigaunt cave in chapter Water Hazard.
Unlocked 29 Nov @ 12:11pm

Revenge!

Destroy the hunter-chopper in Half-Life 2.
Unlocked 17 Nov @ 11:15am

Blast from the Past

Find the HEV Suit Charger faceplate in Eli's scrapyard.
Unlocked 18 Nov @ 8:47am

Zero-Point Energy

Get the Gravity Gun in Black Mesa East.
Unlocked 18 Nov @ 8:46am

Two Points

Use DOG's ball to make a basket in Eli's scrapyard.
Unlocked 30 Nov @ 4:01am

Zombie Chopper

Play through Ravenholm using only the Gravity Gun.
Unlocked 30 Nov @ 12:44am

Hallowed Ground

Escort Gregori safely through the church cemetery.
Unlocked 19 Nov @ 1:56am

Targetted Advertising

Pin a soldier to the billboard in chapter Highway 17.
Unlocked 20 Nov @ 3:43am

Where Cubbage Fears to Tread

Defend Little Odessa from the gunship attack.
Unlocked 19 Nov @ 2:56am

Bug Hunt

Use the antlions to kill 50 enemies.
Unlocked 22 Nov @ 9:31pm

Flushed

Kill an enemy with a toilet.
Unlocked 22 Nov @ 7:20am

Warden Freeman

Survive the second turret standoff in Nova Prospekt.
Unlocked 23 Nov @ 12:05am

Follow Freeman

Gain command of a squad of rebels in the uprising.
Unlocked 23 Nov @ 12:22am

Radiation Levels Detected

Get through the toxic tunnel under City 17 in Half-Life 2.
Unlocked 23 Nov @ 4:10am

Plaza Defender

Survive the generator plaza standoff in chapter Anticitizen One.
Unlocked 23 Nov @ 4:34am

Counter-Sniper

Kill all of the snipers in City 17.
Unlocked 23 Nov @ 5:03am

Fight the Power

Shut down the supression device by disabling its generators.
Unlocked 23 Nov @ 6:29am

Giant Killer

Survive the rooftop strider battle in the ruins of City 17.
Unlocked 23 Nov @ 7:56am

Singularity Collapse

Destroy the Citadel's reactor core.
Unlocked 23 Nov @ 9:22am

Watch Your Head!

Make it to the bottom of the Citadel's main elevator shaft in one piece.
Unlocked 23 Nov @ 10:50am

Containment

Contain the Citadel core.
Unlocked 23 Nov @ 11:14pm

Elevator Action

Survive long enough to get on the parking garage elevator.
Unlocked 27 Nov @ 3:11am

Attica!

Destroy the gunship in the hospital attic.
Unlocked 1 Dec @ 7:30am

Escape From City 17

Escape City 17 with Alyx.
Unlocked 1 Dec @ 8:08am

Acid Reflex

Kill an acid antlion worker.
Unlocked 1 Dec @ 11:59pm

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 2 Dec @ 6:18am

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 2 Dec @ 6:17am

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 1 Dec @ 8:11am



OSHA Violation

Kill 3 enemies using the crane.

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.

Atomizer

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

Lambda Locator

Find all lambda caches in Half-Life 2.

Hack Attack!

Kill five enemies with a Manhack.

Pacifist

Contain the Citadel core without killing any stalkers.

Car Crusher

Use the cars to squash 15 antlions in Episode One.

Live Bait

Help Alyx snipe 30 enemies in Episode One.

Citizen Escort

Don't let any citizens die when escorting them to the escape train.

The One Free Bullet

Finish the game firing exactly one bullet. Grenade, crowbar, rocket, and Gravity Gun kills are okay!

Conservationist

Kill five enemies with the same energy ball.

Think Fast!

Kill an Elite Soldier with his own 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.

Twofer

Defeat both antlion guards outside the White Forest.

Hit and Run

Run over 20 enemies with the car in Episode Two.

Meet the Hunters

Survive the Hunter ambush with Alyx.

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.

Gunishment!

Destroy the Combine Autogun in the junkyard.

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.

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.

Little Rocket Man

Send the garden gnome into space.

Secondary Silo Secured

Secure the launch doors on missile silo 2.

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.

Bone Breaker

Kill 30 enemies with thrown physics objects.

Hot Potat0wned

Kill a Combine soldier with his own grenade.

Grave Robber

Steal a Zombine's grenade.