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28 of 69 (41%) achievements earned:
Personal Achievements
 

What cat?

Break the mini-teleporter in Kleiner's lab.
Unlocked 12 Feb, 2011 @ 1:50am

Trusty Hardware

Get the crowbar.
Unlocked 4 Feb, 2012 @ 12:25pm

Barnacle Bowling

Kill five barnacles with one barrel.
Unlocked 4 Feb, 2012 @ 12:41pm

Anchor's Aweigh!

Get the airboat.
Unlocked 20 Jan, 2011 @ 1:05pm

Heavy Weapons

Get the airboat's mounted gun.
Unlocked 20 Jan, 2011 @ 2:05pm

Vorticough

Discover the hidden singing vortigaunt cave in chapter Water Hazard.
Unlocked 20 Jan, 2011 @ 2:44pm

Revenge!

Destroy the hunter-chopper in Half-Life 2.
Unlocked 20 Jan, 2011 @ 2:36pm

Blast from the Past

Find the HEV Suit Charger faceplate in Eli's scrapyard.
Unlocked 26 Jan, 2011 @ 1:16pm

Zero-Point Energy

Get the Gravity Gun in Black Mesa East.
Unlocked 26 Jan, 2011 @ 1:16pm

Two Points

Use DOG's ball to make a basket in Eli's scrapyard.
Unlocked 26 Jan, 2011 @ 1:21pm

Zombie Chopper

Play through Ravenholm using only the Gravity Gun.
Unlocked 26 Jan, 2011 @ 2:54pm

Hallowed Ground

Escort Gregori safely through the church cemetery.
Unlocked 26 Jan, 2011 @ 2:36pm

OSHA Violation

Kill 3 enemies using the crane.
Unlocked 4 Feb, 2011 @ 6:38pm

Targetted Advertising

Pin a soldier to the billboard in chapter Highway 17.
Unlocked 4 Feb, 2011 @ 6:58pm

Where Cubbage Fears to Tread

Defend Little Odessa from the gunship attack.
Unlocked 26 Jan, 2011 @ 3:31pm

One Man Army

Destroy six gunships in Half-Life 2.
Unlocked 10 Feb, 2011 @ 10:53pm

Keep Off the Sand!

Cross the antlion beach in chapter Sandtraps without touching the sand.
Unlocked 4 Feb, 2011 @ 8:55pm

Bug Hunt

Use the antlions to kill 50 enemies.
Unlocked 10 Feb, 2011 @ 11:05pm

Warden Freeman

Survive the second turret standoff in Nova Prospekt.
Unlocked 12 Feb, 2011 @ 1:25am

Follow Freeman

Gain command of a squad of rebels in the uprising.
Unlocked 12 Feb, 2011 @ 2:03am

Radiation Levels Detected

Get through the toxic tunnel under City 17 in Half-Life 2.
Unlocked 12 Feb, 2011 @ 2:34am

Plaza Defender

Survive the generator plaza standoff in chapter Anticitizen One.
Unlocked 12 Feb, 2011 @ 7:13am

Counter-Sniper

Kill all of the snipers in City 17.
Unlocked 12 Feb, 2011 @ 7:49am

Fight the Power

Shut down the supression device by disabling its generators.
Unlocked 12 Feb, 2011 @ 8:14am

Giant Killer

Survive the rooftop strider battle in the ruins of City 17.
Unlocked 16 Feb, 2011 @ 6:27pm

Atomizer

Disintegrate 15 soldiers by throwing them into a Combine ball field.
Unlocked 16 Feb, 2011 @ 6:42pm

Singularity Collapse

Destroy the Citadel's reactor core.
Unlocked 16 Feb, 2011 @ 7:14pm

Hack Attack!

Kill five enemies with a Manhack.
Unlocked 10 Feb, 2011 @ 11:00pm



Malcontent

Escape the apartment block raid.

Flushed

Kill an enemy with a toilet.

Lambda Locator

Find all lambda caches in Half-Life 2.

Watch Your Head!

Make it to the bottom of the Citadel's main elevator shaft in one piece.

Containment

Contain the Citadel core.

Pacifist

Contain the Citadel core without killing any stalkers.

Car Crusher

Use the cars to squash 15 antlions in Episode One.

Elevator Action

Survive long enough to get on the parking garage elevator.

Live Bait

Help Alyx snipe 30 enemies in Episode One.

Attica!

Destroy the gunship in the hospital attic.

Citizen Escort

Don't let any citizens die when escorting them to the escape train.

Escape From City 17

Escape City 17 with Alyx.

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.

Acid Reflex

Kill an acid antlion worker.

Get Some Grub

Squish every antlion grub in Episode Two.

Piñata Party

Find and break every web cache in Episode Two.

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.

Twofer

Defeat both antlion guards outside the White Forest.

Hit and Run

Run over 20 enemies with the car in Episode Two.

Meet the Hunters

Survive the Hunter ambush with Alyx.

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.

Gunishment!

Destroy the Combine Autogun in the junkyard.

Cache Checker

Find every radar cache in chapter Under The Radar.

Pedal to the Metal

Beat DOG in a race to the White Forest base.

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.

Little Rocket Man

Send the garden gnome into space.

Secondary Silo Secured

Secure the launch doors on missile silo 2.

Neighborhood Watch

Save all buildings outside the missile silo from destruction.

Defense of the Armament

Save the missile silo from the Combine offensive.

Payback

Kill a Hunter with its own flechettes.

Bone Breaker

Kill 30 enemies with thrown physics objects.

Deadly Harvest

Kill an enemy by planting a hopper mine.

Hot Potat0wned

Kill a Combine soldier with his own grenade.

Grave Robber

Steal a Zombine's grenade.

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.
+2

2 hidden achievements remaining

Details for each achievement will be revealed once unlocked