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23 of 69 (33%) achievements earned:
Personal Achievements
 

Defiant

Hit the trashcan cop with the can.
Unlocked 17 Nov @ 5:47am

Malcontent

Escape the apartment block raid.
Unlocked 17 Nov @ 5:56am

Trusty Hardware

Get the crowbar.
Unlocked 17 Nov @ 6:10am

Watch Your Head!

Make it to the bottom of the Citadel's main elevator shaft in one piece.
Unlocked 20 Nov @ 5:49am

Containment

Contain the Citadel core.
Unlocked 20 Nov @ 6:06am

Elevator Action

Survive long enough to get on the parking garage elevator.
Unlocked 20 Nov @ 6:42am

Attica!

Destroy the gunship in the hospital attic.
Unlocked 26 Dec @ 12:14pm

Escape From City 17

Escape City 17 with Alyx.
Unlocked 27 Dec @ 1:01am

Acid Reflex

Kill an acid antlion worker.
Unlocked 27 Dec @ 1:25am

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 27 Dec @ 1:48am

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 27 Dec @ 2:43am

Hit and Run

Run over 20 enemies with the car in Episode Two.
Unlocked 27 Dec @ 5:27am

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 27 Dec @ 3:35am

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 27 Dec @ 3:53am

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 27 Dec @ 4:23am

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked 27 Dec @ 4:30am

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 27 Dec @ 3:58am

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 27 Dec @ 4:15am

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 27 Dec @ 5:12am

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 27 Dec @ 5:48am

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 27 Dec @ 1:37am

Grave Robber

Steal a Zombine's grenade.
Unlocked 27 Dec @ 1:10am

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 27 Dec @ 1:03am



What cat?

Break the mini-teleporter in Kleiner's lab.

Barnacle Bowling

Kill five barnacles with one barrel.

Anchor's Aweigh!

Get the airboat.

Heavy Weapons

Get the airboat's mounted gun.

Vorticough

Discover the hidden singing vortigaunt cave in chapter Water Hazard.

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.

OSHA Violation

Kill 3 enemies using the crane.

Targetted Advertising

Pin a soldier to the billboard in chapter Highway 17.

One Man Army

Destroy six gunships in Half-Life 2.

Keep Off the Sand!

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

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.

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.

Counter-Sniper

Kill all of the snipers in City 17.

Fight the Power

Shut down the supression device by disabling its generators.

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.

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.

Citizen Escort

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

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.

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.

Payback

Kill a Hunter with its own flechettes.

Bone Breaker

Kill 30 enemies with thrown physics objects.

Hot Potat0wned

Kill a Combine soldier with his own grenade.
+4

4 hidden achievements remaining

Details for each achievement will be revealed once unlocked