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35 of 69 (51%) achievements earned:
Personal Achievements
 

Malcontent

Escape the apartment block raid.
Unlocked 17 Nov @ 7:14pm

Trusty Hardware

Get the crowbar.
Unlocked 17 Nov @ 8:25pm

Anchor's Aweigh!

Get the airboat.
Unlocked 17 Nov @ 10:18pm

Heavy Weapons

Get the airboat's mounted gun.
Unlocked 17 Nov @ 11:16pm

Revenge!

Destroy the hunter-chopper in Half-Life 2.
Unlocked 17 Nov @ 11:39pm

Zero-Point Energy

Get the Gravity Gun in Black Mesa East.
Unlocked 19 Nov @ 3:17am

Hallowed Ground

Escort Gregori safely through the church cemetery.
Unlocked 19 Nov @ 4:15am

OSHA Violation

Kill 3 enemies using the crane.
Unlocked 19 Nov @ 5:08am

Where Cubbage Fears to Tread

Defend Little Odessa from the gunship attack.
Unlocked 19 Nov @ 4:55am

One Man Army

Destroy six gunships in Half-Life 2.
Unlocked 20 Nov @ 1:06am

Bug Hunt

Use the antlions to kill 50 enemies.
Unlocked 20 Nov @ 1:00am

Warden Freeman

Survive the second turret standoff in Nova Prospekt.
Unlocked 20 Nov @ 11:06pm

Follow Freeman

Gain command of a squad of rebels in the uprising.
Unlocked 20 Nov @ 11:32pm

Radiation Levels Detected

Get through the toxic tunnel under City 17 in Half-Life 2.
Unlocked 20 Nov @ 11:58pm

Plaza Defender

Survive the generator plaza standoff in chapter Anticitizen One.
Unlocked 21 Nov @ 12:19am

Fight the Power

Shut down the supression device by disabling its generators.
Unlocked 21 Nov @ 3:20am

Giant Killer

Survive the rooftop strider battle in the ruins of City 17.
Unlocked 21 Nov @ 7:23am

Singularity Collapse

Destroy the Citadel's reactor core.
Unlocked 21 Nov @ 8:07am

Watch Your Head!

Make it to the bottom of the Citadel's main elevator shaft in one piece.
Unlocked 22 Nov @ 12:01am

Containment

Contain the Citadel core.
Unlocked 22 Nov @ 12:14am

Elevator Action

Survive long enough to get on the parking garage elevator.
Unlocked 22 Nov @ 1:00am

Attica!

Destroy the gunship in the hospital attic.
Unlocked 22 Nov @ 2:54am

Citizen Escort

Don't let any citizens die when escorting them to the escape train.
Unlocked 22 Nov @ 3:37am

Escape From City 17

Escape City 17 with Alyx.
Unlocked 22 Nov @ 3:37am

Conservationist

Kill five enemies with the same energy ball.
Unlocked 22 Nov @ 2:54am

Acid Reflex

Kill an acid antlion worker.
Unlocked 23 Nov @ 5:52am

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 23 Nov @ 6:18am

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 23 Nov @ 9:49pm

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 23 Nov @ 10:42pm

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 23 Nov @ 11:26pm

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 23 Nov @ 11:37pm

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 24 Nov @ 12:45am

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 24 Nov @ 1:42am

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 23 Nov @ 6:12am

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 22 Nov @ 3:39am



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.

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.

The One Free Bullet

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

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.

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