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49 of 69 (71%) achievements earned:
Personal Achievements
 

Defiant

Hit the trashcan cop with the can.
Unlocked 23 Nov @ 10:01am

Malcontent

Escape the apartment block raid.
Unlocked 23 Nov @ 10:10am

What cat?

Break the mini-teleporter in Kleiner's lab.
Unlocked 25 Nov @ 3:28am

Trusty Hardware

Get the crowbar.
Unlocked 23 Nov @ 10:22am

Barnacle Bowling

Kill five barnacles with one barrel.
Unlocked 23 Nov @ 10:38am

Anchor's Aweigh!

Get the airboat.
Unlocked 23 Nov @ 11:14am

Heavy Weapons

Get the airboat's mounted gun.
Unlocked 23 Nov @ 11:47am

Vorticough

Discover the hidden singing vortigaunt cave in chapter Water Hazard.
Unlocked 23 Nov @ 12:02pm

Revenge!

Destroy the hunter-chopper in Half-Life 2.
Unlocked 23 Nov @ 11:58am

Zero-Point Energy

Get the Gravity Gun in Black Mesa East.
Unlocked 23 Nov @ 12:19pm

Hallowed Ground

Escort Gregori safely through the church cemetery.
Unlocked 23 Nov @ 1:11pm

Where Cubbage Fears to Tread

Defend Little Odessa from the gunship attack.
Unlocked 24 Nov @ 10:27am

One Man Army

Destroy six gunships in Half-Life 2.
Unlocked 24 Nov @ 12:08pm

Bug Hunt

Use the antlions to kill 50 enemies.
Unlocked 24 Nov @ 12:37pm

Flushed

Kill an enemy with a toilet.
Unlocked 24 Nov @ 12:21pm

Warden Freeman

Survive the second turret standoff in Nova Prospekt.
Unlocked 24 Nov @ 1:12pm

Follow Freeman

Gain command of a squad of rebels in the uprising.
Unlocked 25 Nov @ 3:32am

Radiation Levels Detected

Get through the toxic tunnel under City 17 in Half-Life 2.
Unlocked 25 Nov @ 3:51am

Plaza Defender

Survive the generator plaza standoff in chapter Anticitizen One.
Unlocked 25 Nov @ 4:07am

Counter-Sniper

Kill all of the snipers in City 17.
Unlocked 25 Nov @ 4:24am

Fight the Power

Shut down the supression device by disabling its generators.
Unlocked 25 Nov @ 4:41am

Giant Killer

Survive the rooftop strider battle in the ruins of City 17.
Unlocked 25 Nov @ 5:01am

Atomizer

Disintegrate 15 soldiers by throwing them into a Combine ball field.
Unlocked 25 Nov @ 11:24am

Singularity Collapse

Destroy the Citadel's reactor core.
Unlocked 25 Nov @ 11:26am

Hack Attack!

Kill five enemies with a Manhack.
Unlocked 24 Nov @ 1:11pm

Watch Your Head!

Make it to the bottom of the Citadel's main elevator shaft in one piece.
Unlocked 25 Nov @ 11:57am

Containment

Contain the Citadel core.
Unlocked 25 Nov @ 12:12pm

Pacifist

Contain the Citadel core without killing any stalkers.
Unlocked 25 Nov @ 12:32pm

Car Crusher

Use the cars to squash 15 antlions in Episode One.
Unlocked 25 Nov @ 12:58pm

Elevator Action

Survive long enough to get on the parking garage elevator.
Unlocked 25 Nov @ 12:53pm

Live Bait

Help Alyx snipe 30 enemies in Episode One.
Unlocked 25 Nov @ 1:08pm

Attica!

Destroy the gunship in the hospital attic.
Unlocked 25 Nov @ 1:38pm

Citizen Escort

Don't let any citizens die when escorting them to the escape train.
Unlocked 26 Nov @ 5:45am

Escape From City 17

Escape City 17 with Alyx.
Unlocked 26 Nov @ 5:51am

Zombie-que

Use flares to light 15 zombies on fire.
Unlocked 25 Nov @ 12:52pm

Acid Reflex

Kill an acid antlion worker.
Unlocked 26 Nov @ 6:15am

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 26 Nov @ 6:32am

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 26 Nov @ 11:31am

Hit and Run

Run over 20 enemies with the car in Episode Two.
Unlocked 26 Nov @ 12:24pm

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 26 Nov @ 12:00pm

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 26 Nov @ 12:19pm

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 26 Nov @ 12:44pm

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked 26 Nov @ 12:49pm

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 26 Nov @ 12:28pm

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 26 Nov @ 12:39pm

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 26 Nov @ 1:06pm

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 26 Nov @ 1:34pm

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 26 Nov @ 6:27am

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 @ 5:55am



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.

Lambda Locator

Find all lambda caches in Half-Life 2.

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.

Get Some Grub

Squish every antlion grub in Episode Two.

Piñata Party

Find and break every web cache in Episode Two.

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.

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.
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