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51 of 69 (74%) achievements earned:
Personal Achievements
 

Defiant

Hit the trashcan cop with the can.
Unlocked 11 Sep, 2011 @ 3:45am

Submissive

Put the can in the trash.
Unlocked 21 Aug, 2010 @ 6:33am

Malcontent

Escape the apartment block raid.
Unlocked 21 Aug, 2010 @ 6:36am

What cat?

Break the mini-teleporter in Kleiner's lab.
Unlocked 6 Jun, 2014 @ 2:37pm

Trusty Hardware

Get the crowbar.
Unlocked 21 Aug, 2010 @ 6:49am

Barnacle Bowling

Kill five barnacles with one barrel.
Unlocked 21 Aug, 2010 @ 7:00am

Anchor's Aweigh!

Get the airboat.
Unlocked 27 Oct, 2010 @ 2:37pm

Heavy Weapons

Get the airboat's mounted gun.
Unlocked 30 Oct, 2010 @ 7:43am

Vorticough

Discover the hidden singing vortigaunt cave in chapter Water Hazard.
Unlocked 7 Jan, 2014 @ 1:08pm

Revenge!

Destroy the hunter-chopper in Half-Life 2.
Unlocked 7 Jan, 2014 @ 1:07pm

Blast from the Past

Find the HEV Suit Charger faceplate in Eli's scrapyard.
Unlocked 5 Nov, 2010 @ 6:33pm

Zero-Point Energy

Get the Gravity Gun in Black Mesa East.
Unlocked 5 Nov, 2010 @ 6:33pm

Two Points

Use DOG's ball to make a basket in Eli's scrapyard.
Unlocked 6 Jun, 2014 @ 1:18pm

Zombie Chopper

Play through Ravenholm using only the Gravity Gun.
Unlocked 6 Jun, 2014 @ 1:52pm

Hallowed Ground

Escort Gregori safely through the church cemetery.
Unlocked 4 Mar, 2011 @ 11:03am

OSHA Violation

Kill 3 enemies using the crane.
Unlocked 6 Jun, 2014 @ 2:10pm

Targetted Advertising

Pin a soldier to the billboard in chapter Highway 17.
Unlocked 4 Mar, 2011 @ 11:56am

Where Cubbage Fears to Tread

Defend Little Odessa from the gunship attack.
Unlocked 4 Mar, 2011 @ 11:33am

One Man Army

Destroy six gunships in Half-Life 2.
Unlocked 4 Mar, 2011 @ 1:08pm

Bug Hunt

Use the antlions to kill 50 enemies.
Unlocked 4 Mar, 2011 @ 1:22pm

Warden Freeman

Survive the second turret standoff in Nova Prospekt.
Unlocked 6 Mar, 2011 @ 1:01pm

Follow Freeman

Gain command of a squad of rebels in the uprising.
Unlocked 6 Mar, 2011 @ 1:20pm

Radiation Levels Detected

Get through the toxic tunnel under City 17 in Half-Life 2.
Unlocked 8 Jun, 2014 @ 2:24pm

Plaza Defender

Survive the generator plaza standoff in chapter Anticitizen One.
Unlocked 29 Mar, 2011 @ 12:08am

Counter-Sniper

Kill all of the snipers in City 17.
Unlocked 8 Jun, 2014 @ 2:53pm

Fight the Power

Shut down the supression device by disabling its generators.
Unlocked 7 Mar, 2011 @ 9:25am

Giant Killer

Survive the rooftop strider battle in the ruins of City 17.
Unlocked 7 Mar, 2011 @ 10:11am

Atomizer

Disintegrate 15 soldiers by throwing them into a Combine ball field.
Unlocked 9 Jun, 2014 @ 2:09am

Singularity Collapse

Destroy the Citadel's reactor core.
Unlocked 5 Nov, 2010 @ 6:23pm

Watch Your Head!

Make it to the bottom of the Citadel's main elevator shaft in one piece.
Unlocked 16 Nov @ 9:14am

Containment

Contain the Citadel core.
Unlocked 16 Nov @ 9:14am

Elevator Action

Survive long enough to get on the parking garage elevator.
Unlocked 16 Nov @ 9:14am

Attica!

Destroy the gunship in the hospital attic.
Unlocked 16 Nov @ 9:14am

Citizen Escort

Don't let any citizens die when escorting them to the escape train.
Unlocked 16 Nov @ 9:14am

Escape From City 17

Escape City 17 with Alyx.
Unlocked 16 Nov @ 9:14am

Think Fast!

Kill an Elite Soldier with his own energy ball.
Unlocked 16 Nov @ 9:14am

Acid Reflex

Kill an acid antlion worker.
Unlocked 16 Nov @ 9:14am

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 16 Nov @ 9:14am

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 16 Nov @ 9:14am

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 16 Nov @ 9:14am

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 16 Nov @ 9:14am

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked 16 Nov @ 9:14am

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 16 Nov @ 9:14am

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 16 Nov @ 9:14am

Little Rocket Man

Send the garden gnome into space.
Unlocked 16 Nov @ 9:14am

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 16 Nov @ 9:14am

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 16 Nov @ 9:14am

Payback

Kill a Hunter with its own flechettes.
Unlocked 16 Nov @ 9:14am

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 16 Nov @ 9:14am

Grave Robber

Steal a Zombine's grenade.
Unlocked 16 Nov @ 9:14am

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 Nov @ 9:14am



Keep Off the Sand!

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

Flushed

Kill an enemy with a toilet.

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!

Conservationist

Kill five enemies with the same 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.

Neighborhood Watch

Save all buildings outside the missile silo from destruction.

Bone Breaker

Kill 30 enemies with thrown physics objects.

Hot Potat0wned

Kill a Combine soldier with his own grenade.