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

Defiant

Hit the trashcan cop with the can.
Unlocked 16 Jul, 2014 @ 12:04am

Submissive

Put the can in the trash.
Unlocked 13 Jan, 2012 @ 9:35am

Malcontent

Escape the apartment block raid.
Unlocked 13 Jan, 2012 @ 9:56am

What cat?

Break the mini-teleporter in Kleiner's lab.
Unlocked 13 Jan, 2012 @ 10:01am

Trusty Hardware

Get the crowbar.
Unlocked 13 Jan, 2012 @ 10:09am

Barnacle Bowling

Kill five barnacles with one barrel.
Unlocked 13 Jan, 2012 @ 10:22am

Anchor's Aweigh!

Get the airboat.
Unlocked 16 Jan, 2012 @ 8:27am

Heavy Weapons

Get the airboat's mounted gun.
Unlocked 16 Jan, 2012 @ 8:56am

Vorticough

Discover the hidden singing vortigaunt cave in chapter Water Hazard.
Unlocked 4 Aug, 2014 @ 8:08am

Revenge!

Destroy the hunter-chopper in Half-Life 2.
Unlocked 23 Jan, 2012 @ 7:33am

Blast from the Past

Find the HEV Suit Charger faceplate in Eli's scrapyard.
Unlocked 23 Jan, 2012 @ 7:59am

Zero-Point Energy

Get the Gravity Gun in Black Mesa East.
Unlocked 23 Jan, 2012 @ 8:00am

Two Points

Use DOG's ball to make a basket in Eli's scrapyard.
Unlocked 4 Aug, 2014 @ 8:41am

Zombie Chopper

Play through Ravenholm using only the Gravity Gun.
Unlocked 5 Aug, 2014 @ 11:13pm

Hallowed Ground

Escort Gregori safely through the church cemetery.
Unlocked 18 Feb, 2012 @ 7:14am

OSHA Violation

Kill 3 enemies using the crane.
Unlocked 18 Feb, 2012 @ 9:01am

Targetted Advertising

Pin a soldier to the billboard in chapter Highway 17.
Unlocked 6 Aug, 2014 @ 1:05am

Where Cubbage Fears to Tread

Defend Little Odessa from the gunship attack.
Unlocked 18 Feb, 2012 @ 8:54am

One Man Army

Destroy six gunships in Half-Life 2.
Unlocked 19 Feb, 2012 @ 12:38am

Keep Off the Sand!

Cross the antlion beach in chapter Sandtraps without touching the sand.
Unlocked 7 Aug, 2014 @ 1:14am

Bug Hunt

Use the antlions to kill 50 enemies.
Unlocked 7 Aug, 2014 @ 1:31am

Flushed

Kill an enemy with a toilet.
Unlocked 19 Feb, 2012 @ 12:47am

Warden Freeman

Survive the second turret standoff in Nova Prospekt.
Unlocked 19 Feb, 2012 @ 1:44am

Follow Freeman

Gain command of a squad of rebels in the uprising.
Unlocked 19 Feb, 2012 @ 2:04am

Radiation Levels Detected

Get through the toxic tunnel under City 17 in Half-Life 2.
Unlocked 19 Feb, 2012 @ 2:29am

Plaza Defender

Survive the generator plaza standoff in chapter Anticitizen One.
Unlocked 19 Feb, 2012 @ 2:47am

Counter-Sniper

Kill all of the snipers in City 17.
Unlocked 19 Feb, 2012 @ 3:11am

Fight the Power

Shut down the supression device by disabling its generators.
Unlocked 19 Feb, 2012 @ 3:29am

Giant Killer

Survive the rooftop strider battle in the ruins of City 17.
Unlocked 19 Feb, 2012 @ 3:58am

Atomizer

Disintegrate 15 soldiers by throwing them into a Combine ball field.
Unlocked 19 Feb, 2012 @ 4:20am

Singularity Collapse

Destroy the Citadel's reactor core.
Unlocked 19 Feb, 2012 @ 4:49am

Lambda Locator

Find all lambda caches in Half-Life 2.
Unlocked 7 Aug, 2014 @ 9:54am

Hack Attack!

Kill five enemies with a Manhack.
Unlocked 19 Feb, 2012 @ 2:25am

Watch Your Head!

Make it to the bottom of the Citadel's main elevator shaft in one piece.
Unlocked 24 Nov @ 2:32am

Containment

Contain the Citadel core.
Unlocked 24 Nov @ 2:32am

Pacifist

Contain the Citadel core without killing any stalkers.
Unlocked 24 Nov @ 2:32am

Car Crusher

Use the cars to squash 15 antlions in Episode One.
Unlocked 24 Nov @ 2:32am

Elevator Action

Survive long enough to get on the parking garage elevator.
Unlocked 24 Nov @ 2:32am

Live Bait

Help Alyx snipe 30 enemies in Episode One.
Unlocked 24 Nov @ 2:32am

Attica!

Destroy the gunship in the hospital attic.
Unlocked 24 Nov @ 2:32am

Citizen Escort

Don't let any citizens die when escorting them to the escape train.
Unlocked 24 Nov @ 2:32am

Escape From City 17

Escape City 17 with Alyx.
Unlocked 24 Nov @ 2:32am

The One Free Bullet

Finish the game firing exactly one bullet. Grenade, crowbar, rocket, and Gravity Gun kills are okay!
Unlocked 26 Nov @ 9:20am

Conservationist

Kill five enemies with the same energy ball.
Unlocked 24 Nov @ 2:32am

Think Fast!

Kill an Elite Soldier with his own energy ball.
Unlocked 24 Nov @ 2:32am

Zombie-que

Use flares to light 15 zombies on fire.
Unlocked 24 Nov @ 2:32am

Acid Reflex

Kill an acid antlion worker.
Unlocked 24 Nov @ 2:32am

Get Some Grub

Squish every antlion grub in Episode Two.
Unlocked 24 Nov @ 2:32am

Piñata Party

Find and break every web cache in Episode Two.
Unlocked 24 Nov @ 2:32am

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 24 Nov @ 2:32am

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 24 Nov @ 2:32am

Hit and Run

Run over 20 enemies with the car in Episode Two.
Unlocked 24 Nov @ 2:32am

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 24 Nov @ 2:32am

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.
Unlocked 24 Nov @ 2:32am

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 24 Nov @ 2:32am

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 24 Nov @ 2:32am

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked 24 Nov @ 2:32am

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 24 Nov @ 2:32am

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 24 Nov @ 2:32am

Little Rocket Man

Send the garden gnome into space.
Unlocked 24 Nov @ 2:32am

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 24 Nov @ 2:32am

Neighborhood Watch

Save all buildings outside the missile silo from destruction.
Unlocked 24 Nov @ 2:32am

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 24 Nov @ 2:32am

Payback

Kill a Hunter with its own flechettes.
Unlocked 24 Nov @ 2:32am

Bone Breaker

Kill 30 enemies with thrown physics objects.
Unlocked 24 Nov @ 2:32am

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 24 Nov @ 2:32am

Hot Potat0wned

Kill a Combine soldier with his own grenade.
Unlocked 24 Nov @ 2:32am

Grave Robber

Steal a Zombine's grenade.
Unlocked 24 Nov @ 2:32am

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 24 Nov @ 2:32am