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

Defiant

Hit the trashcan cop with the can.
Unlocked 14 Oct @ 10:44pm

Submissive

Put the can in the trash.
Unlocked 19 Dec @ 4:56am

Malcontent

Escape the apartment block raid.
Unlocked 14 Oct @ 10:50pm

Trusty Hardware

Get the crowbar.
Unlocked 14 Oct @ 11:04pm

Barnacle Bowling

Kill five barnacles with one barrel.
Unlocked 7 Dec @ 7:03pm

Anchor's Aweigh!

Get the airboat.
Unlocked 15 Oct @ 12:12am

Heavy Weapons

Get the airboat's mounted gun.
Unlocked 17 Oct @ 3:00pm

Revenge!

Destroy the hunter-chopper in Half-Life 2.
Unlocked 17 Oct @ 3:26pm

Zero-Point Energy

Get the Gravity Gun in Black Mesa East.
Unlocked 17 Oct @ 9:20pm

Hallowed Ground

Escort Gregori safely through the church cemetery.
Unlocked 18 Oct @ 10:29pm

Where Cubbage Fears to Tread

Defend Little Odessa from the gunship attack.
Unlocked 19 Oct @ 5:53pm

Bug Hunt

Use the antlions to kill 50 enemies.
Unlocked 18 Nov @ 9:19pm

Warden Freeman

Survive the second turret standoff in Nova Prospekt.
Unlocked 21 Nov @ 5:54pm

Follow Freeman

Gain command of a squad of rebels in the uprising.
Unlocked 21 Nov @ 6:14pm

Radiation Levels Detected

Get through the toxic tunnel under City 17 in Half-Life 2.
Unlocked 21 Nov @ 6:59pm

Plaza Defender

Survive the generator plaza standoff in chapter Anticitizen One.
Unlocked 23 Nov @ 9:04pm

Fight the Power

Shut down the supression device by disabling its generators.
Unlocked 25 Nov @ 6:43pm

Giant Killer

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

Singularity Collapse

Destroy the Citadel's reactor core.
Unlocked 25 Nov @ 9:38pm

Watch Your Head!

Make it to the bottom of the Citadel's main elevator shaft in one piece.
Unlocked 25 Nov @ 10:13pm

Containment

Contain the Citadel core.
Unlocked 25 Nov @ 10:27pm

Elevator Action

Survive long enough to get on the parking garage elevator.
Unlocked 26 Nov @ 2:49pm

Attica!

Destroy the gunship in the hospital attic.
Unlocked 26 Nov @ 6:46pm

Escape From City 17

Escape City 17 with Alyx.
Unlocked 26 Nov @ 7:27pm

Acid Reflex

Kill an acid antlion worker.
Unlocked 26 Nov @ 7:48pm

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 26 Nov @ 8:06pm

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 26 Nov @ 9:01pm

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 26 Nov @ 9:44pm

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 28 Nov @ 6:42am

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 28 Nov @ 6:47am

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 2 Dec @ 1:04pm

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 2 Dec @ 5:39pm

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 2 Dec @ 6:18pm

Payback

Kill a Hunter with its own flechettes.
Unlocked 2 Dec @ 5:55pm

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 26 Nov @ 7:57pm

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 26 Nov @ 7:30pm



What cat?

Break the mini-teleporter in Kleiner's lab.

Vorticough

Discover the hidden singing vortigaunt cave in chapter Water Hazard.

Blast from the Past

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

Two Points

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

Zombie Chopper

Play through Ravenholm using only the Gravity Gun.

OSHA Violation

Kill 3 enemies using the crane.

Targetted Advertising

Pin a soldier to the billboard in chapter Highway 17.

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.

Flushed

Kill an enemy with a toilet.

Counter-Sniper

Kill all of the snipers in City 17.

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.

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.

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.