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

Submissive

Put the can in the trash.
Unlocked 8 Jun, 2010 @ 8:41am

Malcontent

Escape the apartment block raid.

What cat?

Break the mini-teleporter in Kleiner's lab.

Trusty Hardware

Get the crowbar.
Unlocked 8 Jun, 2010 @ 9:46am

Barnacle Bowling

Kill five barnacles with one barrel.

Anchor's Aweigh!

Get the airboat.
Unlocked 9 Jun, 2010 @ 7:11pm

Heavy Weapons

Get the airboat's mounted gun.

Vorticough

Discover the hidden singing vortigaunt cave in chapter Water Hazard.
Unlocked 8 Jun, 2010 @ 9:36pm

Revenge!

Destroy the hunter-chopper in Half-Life 2.

Blast from the Past

Find the HEV Suit Charger faceplate in Eli's scrapyard.

Zero-Point Energy

Get the Gravity Gun in Black Mesa East.

Two Points

Use DOG's ball to make a basket in Eli's scrapyard.

Zombie Chopper

Play through Ravenholm using only the Gravity Gun.
Unlocked 10 Jun, 2010 @ 7:10am

Hallowed Ground

Escort Gregori safely through the church cemetery.

OSHA Violation

Kill 3 enemies using the crane.

Targetted Advertising

Pin a soldier to the billboard in chapter Highway 17.
Unlocked 12 Jun, 2010 @ 8:10am

Where Cubbage Fears to Tread

Defend Little Odessa from the gunship attack.

One Man Army

Destroy six gunships in Half-Life 2.
Unlocked 13 Jun, 2010 @ 8:01pm

Keep Off the Sand!

Cross the antlion beach in chapter Sandtraps without touching the sand.
Unlocked 13 Jun, 2010 @ 8:51am

Bug Hunt

Use the antlions to kill 50 enemies.

Flushed

Kill an enemy with a toilet.

Warden Freeman

Survive the second turret standoff in Nova Prospekt.

Follow Freeman

Gain command of a squad of rebels in the uprising.
Unlocked 14 Jun, 2010 @ 7:02pm

Radiation Levels Detected

Get through the toxic tunnel under City 17 in Half-Life 2.

Plaza Defender

Survive the generator plaza standoff in chapter Anticitizen One.

Fight the Power

Shut down the supression device by disabling its generators.
Unlocked 15 Jun, 2010 @ 4:53pm

Giant Killer

Survive the rooftop strider battle in the ruins of City 17.

Atomizer

Disintegrate 15 soldiers by throwing them into a Combine ball field.
Unlocked 17 Jun, 2010 @ 5:55pm

Singularity Collapse

Destroy the Citadel's reactor core.
Unlocked 17 Jun, 2010 @ 6:11pm

Hack Attack!

Kill five enemies with a Manhack.
Unlocked 14 Jun, 2010 @ 12:40pm

Watch Your Head!

Make it to the bottom of the Citadel's main elevator shaft in one piece.
Unlocked 14 Dec @ 4:47pm

Containment

Contain the Citadel core.
Unlocked 14 Dec @ 4:59pm

Elevator Action

Survive long enough to get on the parking garage elevator.
Unlocked 15 Dec @ 3:15pm

Attica!

Destroy the gunship in the hospital attic.
Unlocked 15 Dec @ 4:52pm

Citizen Escort

Don't let any citizens die when escorting them to the escape train.
Unlocked 15 Dec @ 5:58pm

Escape From City 17

Escape City 17 with Alyx.
Unlocked 15 Dec @ 5:58pm

Acid Reflex

Kill an acid antlion worker.
Unlocked 16 Dec @ 5:14pm

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 16 Dec @ 5:40pm

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 16 Dec @ 6:32pm

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 17 Dec @ 4:26pm

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 17 Dec @ 4:56pm

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 17 Dec @ 5:21pm

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked 17 Dec @ 5:26pm

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 17 Dec @ 5:00pm

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 17 Dec @ 5:15pm

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 17 Dec @ 5:47pm

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 18 Dec @ 4:52pm

Payback

Kill a Hunter with its own flechettes.
Unlocked 17 Dec @ 4:26pm

Bone Breaker

Kill 30 enemies with thrown physics objects.
Unlocked 17 Dec @ 4:26pm

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 16 Dec @ 5:39pm

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 15 Dec @ 6:04pm



Counter-Sniper

Kill all of the snipers in City 17.

Lambda Locator

Find all lambda caches in Half-Life 2.

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.

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.

Little Rocket Man

Send the garden gnome into space.

Neighborhood Watch

Save all buildings outside the missile silo from destruction.

Hot Potat0wned

Kill a Combine soldier with his own grenade.

Grave Robber

Steal a Zombine's grenade.
+1

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