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69 of 69 (100%) achievements earned:
Personal Achievements
 

Defiant

Hit the trashcan cop with the can.
Unlocked 13 Jul, 2013 @ 3:17pm

Submissive

Put the can in the trash.
Unlocked 13 Jul, 2013 @ 3:17pm

Malcontent

Escape the apartment block raid.
Unlocked 27 Dec, 2010 @ 4:52pm

What cat?

Break the mini-teleporter in Kleiner's lab.
Unlocked 11 Sep, 2012 @ 1:33pm

Trusty Hardware

Get the crowbar.
Unlocked 27 Dec, 2010 @ 5:04pm

Barnacle Bowling

Kill five barnacles with one barrel.
Unlocked 27 Dec, 2010 @ 5:17pm

Anchor's Aweigh!

Get the airboat.
Unlocked 28 Dec, 2010 @ 3:36pm

Heavy Weapons

Get the airboat's mounted gun.
Unlocked 16 Jul, 2011 @ 2:06pm

Vorticough

Discover the hidden singing vortigaunt cave in chapter Water Hazard.
Unlocked 16 Jul, 2011 @ 2:20pm

Revenge!

Destroy the hunter-chopper in Half-Life 2.
Unlocked 16 Jul, 2011 @ 2:18pm

Blast from the Past

Find the HEV Suit Charger faceplate in Eli's scrapyard.
Unlocked 16 Jul, 2011 @ 2:42pm

Zero-Point Energy

Get the Gravity Gun in Black Mesa East.
Unlocked 16 Jul, 2011 @ 2:43pm

Two Points

Use DOG's ball to make a basket in Eli's scrapyard.
Unlocked 19 May, 2013 @ 4:04pm

Zombie Chopper

Play through Ravenholm using only the Gravity Gun.
Unlocked 22 May, 2013 @ 3:18pm

Hallowed Ground

Escort Gregori safely through the church cemetery.
Unlocked 16 Jul, 2011 @ 5:58pm

OSHA Violation

Kill 3 enemies using the crane.
Unlocked 16 Jul, 2011 @ 6:47pm

Targetted Advertising

Pin a soldier to the billboard in chapter Highway 17.
Unlocked 16 Jul, 2011 @ 7:04pm

Where Cubbage Fears to Tread

Defend Little Odessa from the gunship attack.
Unlocked 16 Jul, 2011 @ 6:40pm

One Man Army

Destroy six gunships in Half-Life 2.
Unlocked 17 Jul, 2011 @ 11:28am

Keep Off the Sand!

Cross the antlion beach in chapter Sandtraps without touching the sand.
Unlocked 17 Jul, 2011 @ 10:56am

Bug Hunt

Use the antlions to kill 50 enemies.
Unlocked 17 Jul, 2011 @ 11:20am

Flushed

Kill an enemy with a toilet.
Unlocked 19 May, 2013 @ 3:47pm

Warden Freeman

Survive the second turret standoff in Nova Prospekt.
Unlocked 18 Jul, 2011 @ 4:46pm

Follow Freeman

Gain command of a squad of rebels in the uprising.
Unlocked 18 Jul, 2011 @ 5:11pm

Radiation Levels Detected

Get through the toxic tunnel under City 17 in Half-Life 2.
Unlocked 18 Jul, 2011 @ 5:49pm

Plaza Defender

Survive the generator plaza standoff in chapter Anticitizen One.
Unlocked 18 Jul, 2011 @ 6:15pm

Counter-Sniper

Kill all of the snipers in City 17.
Unlocked 24 May, 2013 @ 5:17pm

Fight the Power

Shut down the supression device by disabling its generators.
Unlocked 20 Jul, 2011 @ 9:07am

Giant Killer

Survive the rooftop strider battle in the ruins of City 17.
Unlocked 20 Jul, 2011 @ 10:01am

Atomizer

Disintegrate 15 soldiers by throwing them into a Combine ball field.
Unlocked 20 Jul, 2011 @ 10:23am

Singularity Collapse

Destroy the Citadel's reactor core.
Unlocked 13 Jul, 2013 @ 3:35pm

Lambda Locator

Find all lambda caches in Half-Life 2.
Unlocked 24 May, 2013 @ 5:47pm

Hack Attack!

Kill five enemies with a Manhack.
Unlocked 18 Jul, 2011 @ 5:44pm

Watch Your Head!

Make it to the bottom of the Citadel's main elevator shaft in one piece.
Unlocked 17 Nov @ 11:12am

Containment

Contain the Citadel core.
Unlocked 17 Nov @ 11:12am

Pacifist

Contain the Citadel core without killing any stalkers.
Unlocked 17 Nov @ 11:12am

Car Crusher

Use the cars to squash 15 antlions in Episode One.
Unlocked 17 Nov @ 11:12am

Elevator Action

Survive long enough to get on the parking garage elevator.
Unlocked 17 Nov @ 11:12am

Live Bait

Help Alyx snipe 30 enemies in Episode One.
Unlocked 17 Nov @ 11:12am

Attica!

Destroy the gunship in the hospital attic.
Unlocked 17 Nov @ 11:12am

Citizen Escort

Don't let any citizens die when escorting them to the escape train.
Unlocked 17 Nov @ 11:12am

Escape From City 17

Escape City 17 with Alyx.
Unlocked 17 Nov @ 11:12am

The One Free Bullet

Finish the game firing exactly one bullet. Grenade, crowbar, rocket, and Gravity Gun kills are okay!
Unlocked 17 Nov @ 11:12am

Conservationist

Kill five enemies with the same energy ball.
Unlocked 17 Nov @ 11:12am

Think Fast!

Kill an Elite Soldier with his own energy ball.
Unlocked 17 Nov @ 11:12am

Zombie-que

Use flares to light 15 zombies on fire.
Unlocked 17 Nov @ 11:12am

Acid Reflex

Kill an acid antlion worker.
Unlocked 17 Nov @ 11:12am

Get Some Grub

Squish every antlion grub in Episode Two.
Unlocked 17 Nov @ 11:12am

Piñata Party

Find and break every web cache in Episode Two.
Unlocked 17 Nov @ 11:12am

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 17 Nov @ 11:12am

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 17 Nov @ 11:12am

Hit and Run

Run over 20 enemies with the car in Episode Two.
Unlocked 17 Nov @ 11:12am

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 17 Nov @ 11:12am

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.
Unlocked 17 Nov @ 11:12am

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 17 Nov @ 11:12am

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 17 Nov @ 11:12am

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked 17 Nov @ 11:12am

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 17 Nov @ 11:12am

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 17 Nov @ 11:12am

Little Rocket Man

Send the garden gnome into space.
Unlocked 17 Nov @ 11:12am

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 17 Nov @ 11:12am

Neighborhood Watch

Save all buildings outside the missile silo from destruction.
Unlocked 17 Nov @ 11:12am

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 17 Nov @ 11:12am

Payback

Kill a Hunter with its own flechettes.
Unlocked 17 Nov @ 11:12am

Bone Breaker

Kill 30 enemies with thrown physics objects.
Unlocked 17 Nov @ 11:12am

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 17 Nov @ 11:12am

Hot Potat0wned

Kill a Combine soldier with his own grenade.
Unlocked 17 Nov @ 11:12am

Grave Robber

Steal a Zombine's grenade.
Unlocked 17 Nov @ 11:12am

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 17 Nov @ 10:59am