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

Malcontent

Escape the apartment block raid.
Unlocked 27 Nov @ 9:23am

Trusty Hardware

Get the crowbar.
Unlocked 27 Nov @ 9:34am

Barnacle Bowling

Kill five barnacles with one barrel.
Unlocked 27 Nov @ 9:51am

Anchor's Aweigh!

Get the airboat.
Unlocked 27 Nov @ 10:19am

Heavy Weapons

Get the airboat's mounted gun.
Unlocked 27 Nov @ 10:55am

Revenge!

Destroy the hunter-chopper in Half-Life 2.
Unlocked 27 Nov @ 12:13pm

Zero-Point Energy

Get the Gravity Gun in Black Mesa East.
Unlocked 27 Nov @ 12:28pm

Hallowed Ground

Escort Gregori safely through the church cemetery.
Unlocked 27 Nov @ 1:26pm

OSHA Violation

Kill 3 enemies using the crane.
Unlocked 27 Nov @ 1:57pm

Where Cubbage Fears to Tread

Defend Little Odessa from the gunship attack.
Unlocked 27 Nov @ 1:51pm

One Man Army

Destroy six gunships in Half-Life 2.
Unlocked 29 Nov @ 9:55am

Bug Hunt

Use the antlions to kill 50 enemies.
Unlocked 28 Nov @ 11:52am

Warden Freeman

Survive the second turret standoff in Nova Prospekt.
Unlocked 28 Nov @ 1:19pm

Follow Freeman

Gain command of a squad of rebels in the uprising.
Unlocked 28 Nov @ 1:40pm

Radiation Levels Detected

Get through the toxic tunnel under City 17 in Half-Life 2.
Unlocked 28 Nov @ 2:03pm

Plaza Defender

Survive the generator plaza standoff in chapter Anticitizen One.
Unlocked 28 Nov @ 2:24pm

Fight the Power

Shut down the supression device by disabling its generators.
Unlocked 29 Nov @ 9:51am

Giant Killer

Survive the rooftop strider battle in the ruins of City 17.
Unlocked 30 Nov @ 5:39am

Singularity Collapse

Destroy the Citadel's reactor core.
Unlocked 30 Nov @ 6:22am

Watch Your Head!

Make it to the bottom of the Citadel's main elevator shaft in one piece.
Unlocked 30 Nov @ 1:29pm

Containment

Contain the Citadel core.
Unlocked 30 Nov @ 1:41pm

Elevator Action

Survive long enough to get on the parking garage elevator.
Unlocked 30 Nov @ 2:09pm

Attica!

Destroy the gunship in the hospital attic.
Unlocked 1 Dec @ 2:52am

Escape From City 17

Escape City 17 with Alyx.
Unlocked 3 Dec @ 10:40am

Acid Reflex

Kill an acid antlion worker.
Unlocked 3 Dec @ 11:02am

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 8 Dec @ 3:45am

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 8 Dec @ 4:24am

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 9 Dec @ 1:39pm

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 9 Dec @ 2:10pm

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 9 Dec @ 2:15pm

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 10 Dec @ 7:32am

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 10 Dec @ 8:03am

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 10 Dec @ 8:36am

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 8 Dec @ 3:39am

Grave Robber

Steal a Zombine's grenade.
Unlocked 8 Dec @ 4:36am

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 3 Dec @ 10:44am



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.

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.

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.

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.
+2

2 hidden achievements remaining

Details for each achievement will be revealed once unlocked