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38 of 69 (55%) achievements earned:
Personal Achievements
 

Defiant

Hit the trashcan cop with the can.
Unlocked 15 Nov @ 8:20pm

Malcontent

Escape the apartment block raid.
Unlocked 15 Nov @ 8:23pm

Trusty Hardware

Get the crowbar.
Unlocked 16 Nov @ 6:27pm

Barnacle Bowling

Kill five barnacles with one barrel.
Unlocked 16 Nov @ 6:39pm

Anchor's Aweigh!

Get the airboat.
Unlocked 16 Nov @ 7:06pm

Heavy Weapons

Get the airboat's mounted gun.
Unlocked 16 Nov @ 7:41pm

Revenge!

Destroy the hunter-chopper in Half-Life 2.
Unlocked 16 Nov @ 7:54pm

Zero-Point Energy

Get the Gravity Gun in Black Mesa East.
Unlocked 16 Nov @ 8:07pm

Hallowed Ground

Escort Gregori safely through the church cemetery.
Unlocked 19 Nov @ 7:33am

Where Cubbage Fears to Tread

Defend Little Odessa from the gunship attack.
Unlocked 19 Nov @ 8:00am

One Man Army

Destroy six gunships in Half-Life 2.
Unlocked 21 Nov @ 12:32pm

Bug Hunt

Use the antlions to kill 50 enemies.
Unlocked 19 Nov @ 1:04pm

Warden Freeman

Survive the second turret standoff in Nova Prospekt.
Unlocked 20 Nov @ 11:13am

Follow Freeman

Gain command of a squad of rebels in the uprising.
Unlocked 20 Nov @ 11:35am

Radiation Levels Detected

Get through the toxic tunnel under City 17 in Half-Life 2.
Unlocked 21 Nov @ 11:27am

Plaza Defender

Survive the generator plaza standoff in chapter Anticitizen One.
Unlocked 21 Nov @ 11:46am

Counter-Sniper

Kill all of the snipers in City 17.
Unlocked 21 Nov @ 12:07pm

Fight the Power

Shut down the supression device by disabling its generators.
Unlocked 21 Nov @ 12:27pm

Giant Killer

Survive the rooftop strider battle in the ruins of City 17.
Unlocked 21 Nov @ 4:33pm

Singularity Collapse

Destroy the Citadel's reactor core.
Unlocked 21 Nov @ 5:11pm

Watch Your Head!

Make it to the bottom of the Citadel's main elevator shaft in one piece.
Unlocked 21 Nov @ 5:52pm

Containment

Contain the Citadel core.
Unlocked 21 Nov @ 6:02pm

Elevator Action

Survive long enough to get on the parking garage elevator.
Unlocked 21 Nov @ 6:27pm

Attica!

Destroy the gunship in the hospital attic.
Unlocked 22 Nov @ 7:14am

Escape From City 17

Escape City 17 with Alyx.
Unlocked 22 Nov @ 7:53am

Acid Reflex

Kill an acid antlion worker.
Unlocked 24 Nov @ 7:56pm

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 25 Nov @ 8:29am

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 25 Nov @ 9:12am

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 26 Nov @ 12:51pm

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 26 Nov @ 1:09pm

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 26 Nov @ 6:52pm

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 26 Nov @ 1:14pm

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 26 Nov @ 6:48pm

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 26 Nov @ 7:13pm

Payback

Kill a Hunter with its own flechettes.
Unlocked 26 Nov @ 12:50pm

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 24 Nov @ 8:06pm

Hot Potat0wned

Kill a Combine soldier with his own grenade.
Unlocked 26 Nov @ 7:09pm

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 @ 7:53am



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.

Keep Off the Sand!

Cross the antlion beach in chapter Sandtraps without touching the sand.

Flushed

Kill an enemy with a toilet.

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.

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.

Defense of the Armament

Save the missile silo from the Combine offensive.

Bone Breaker

Kill 30 enemies with thrown physics objects.

Grave Robber

Steal a Zombine's grenade.
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