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33 of 69 (48%) achievements earned:
Personal Achievements
 

Submissive

Put the can in the trash.
Unlocked 6 Dec @ 10:31am

Malcontent

Escape the apartment block raid.
Unlocked 6 Dec @ 10:38am

Trusty Hardware

Get the crowbar.
Unlocked 6 Dec @ 10:49am

Anchor's Aweigh!

Get the airboat.
Unlocked 6 Dec @ 11:47am

Heavy Weapons

Get the airboat's mounted gun.
Unlocked 7 Dec @ 11:49am

Revenge!

Destroy the hunter-chopper in Half-Life 2.
Unlocked 7 Dec @ 12:08pm

Zero-Point Energy

Get the Gravity Gun in Black Mesa East.
Unlocked 7 Dec @ 12:24pm

Where Cubbage Fears to Tread

Defend Little Odessa from the gunship attack.
Unlocked 8 Dec @ 11:18am

One Man Army

Destroy six gunships in Half-Life 2.
Unlocked 11 Dec @ 12:29pm

Bug Hunt

Use the antlions to kill 50 enemies.
Unlocked 10 Dec @ 10:15am

Warden Freeman

Survive the second turret standoff in Nova Prospekt.
Unlocked 10 Dec @ 11:38am

Follow Freeman

Gain command of a squad of rebels in the uprising.
Unlocked 10 Dec @ 11:56am

Radiation Levels Detected

Get through the toxic tunnel under City 17 in Half-Life 2.
Unlocked 10 Dec @ 12:27pm

Plaza Defender

Survive the generator plaza standoff in chapter Anticitizen One.
Unlocked 11 Dec @ 11:21am

Fight the Power

Shut down the supression device by disabling its generators.
Unlocked 11 Dec @ 12:19pm

Giant Killer

Survive the rooftop strider battle in the ruins of City 17.
Unlocked 12 Dec @ 1:09pm

Singularity Collapse

Destroy the Citadel's reactor core.
Unlocked 14 Dec @ 12:03pm

Watch Your Head!

Make it to the bottom of the Citadel's main elevator shaft in one piece.
Unlocked 14 Dec @ 12:52pm

Containment

Contain the Citadel core.
Unlocked 14 Dec @ 12:59pm

Elevator Action

Survive long enough to get on the parking garage elevator.
Unlocked 15 Dec @ 11:28am

Attica!

Destroy the gunship in the hospital attic.
Unlocked 15 Dec @ 12:20pm

Escape From City 17

Escape City 17 with Alyx.
Unlocked 15 Dec @ 1:02pm

Acid Reflex

Kill an acid antlion worker.
Unlocked 16 Dec @ 10:22am

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 16 Dec @ 10:47am

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 16 Dec @ 11:41am

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 17 Dec @ 1:12pm

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 17 Dec @ 1:43pm

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked 18 Dec @ 12:16pm

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 18 Dec @ 12:04pm

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 19 Dec @ 10:24am

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 19 Dec @ 11:11am

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 16 Dec @ 10:36am

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 Dec @ 9:57am



What cat?

Break the mini-teleporter in Kleiner's lab.

Barnacle Bowling

Kill five barnacles with one barrel.

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.

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.

Gordon Propelled Rocket

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

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.

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.
+2

2 hidden achievements remaining

Details for each achievement will be revealed once unlocked