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24 of 69 (35%) achievements earned:
Personal Achievements
 

Defiant

Hit the trashcan cop with the can.
Unlocked 23 Nov @ 8:41am

Malcontent

Escape the apartment block raid.
Unlocked 23 Nov @ 8:47am

Trusty Hardware

Get the crowbar.
Unlocked 23 Nov @ 8:59am

Anchor's Aweigh!

Get the airboat.
Unlocked 23 Nov @ 9:38am

Heavy Weapons

Get the airboat's mounted gun.
Unlocked 24 Nov @ 10:24pm

Revenge!

Destroy the hunter-chopper in Half-Life 2.
Unlocked 24 Nov @ 10:40pm

Zero-Point Energy

Get the Gravity Gun in Black Mesa East.
Unlocked 7 Dec @ 12:47am

Hallowed Ground

Escort Gregori safely through the church cemetery.
Unlocked 7 Dec @ 1:36am

Targetted Advertising

Pin a soldier to the billboard in chapter Highway 17.
Unlocked 14 Dec @ 6:25am

Where Cubbage Fears to Tread

Defend Little Odessa from the gunship attack.
Unlocked 7 Dec @ 2:08am

One Man Army

Destroy six gunships in Half-Life 2.
Unlocked 14 Dec @ 8:40am

Bug Hunt

Use the antlions to kill 50 enemies.
Unlocked 14 Dec @ 8:35am

Warden Freeman

Survive the second turret standoff in Nova Prospekt.
Unlocked 15 Dec @ 8:26am

Follow Freeman

Gain command of a squad of rebels in the uprising.
Unlocked 15 Dec @ 8:49am

Radiation Levels Detected

Get through the toxic tunnel under City 17 in Half-Life 2.
Unlocked 15 Dec @ 9:28am

Plaza Defender

Survive the generator plaza standoff in chapter Anticitizen One.
Unlocked 20 Dec @ 5:30am

Fight the Power

Shut down the supression device by disabling its generators.
Unlocked 20 Dec @ 7:08am

Giant Killer

Survive the rooftop strider battle in the ruins of City 17.
Unlocked 20 Dec @ 11:39am

Singularity Collapse

Destroy the Citadel's reactor core.
Unlocked 20 Dec @ 12:26pm

Watch Your Head!

Make it to the bottom of the Citadel's main elevator shaft in one piece.
Unlocked 21 Dec @ 1:43am

Containment

Contain the Citadel core.
Unlocked 22 Dec @ 9:34am

Car Crusher

Use the cars to squash 15 antlions in Episode One.
Unlocked 23 Dec @ 5:59am

Elevator Action

Survive long enough to get on the parking garage elevator.
Unlocked 23 Dec @ 5:53am

Think Fast!

Kill an Elite Soldier with his own energy ball.
Unlocked 22 Dec @ 9:28am



What cat?

Break the mini-teleporter in Kleiner's lab.

Barnacle Bowling

Kill five barnacles with one barrel.

Vorticough

Discover the hidden singing vortigaunt cave in chapter Water Hazard.

Blast from the Past

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

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.

Keep Off the Sand!

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

Flushed

Kill an enemy with a toilet.

Counter-Sniper

Kill all of the snipers in 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.

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.

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.
+1

1 hidden achievement remaining

Details for each achievement will be revealed once unlocked