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46 of 69 (67%) achievements earned:
Personal Achievements
 

Defiant

Hit the trashcan cop with the can.
Unlocked 21 Jan, 2012 @ 4:27pm

Submissive

Put the can in the trash.
Unlocked 3 May, 2012 @ 8:03pm

Malcontent

Escape the apartment block raid.
Unlocked 21 Jan, 2012 @ 4:30pm

What cat?

Break the mini-teleporter in Kleiner's lab.
Unlocked 21 Jan, 2012 @ 4:36pm

Trusty Hardware

Get the crowbar.
Unlocked 3 May, 2012 @ 8:20pm

Barnacle Bowling

Kill five barnacles with one barrel.
Unlocked 3 May, 2012 @ 8:31pm

Anchor's Aweigh!

Get the airboat.
Unlocked 5 May, 2012 @ 9:36pm

Heavy Weapons

Get the airboat's mounted gun.
Unlocked 9 May, 2012 @ 11:37pm

Vorticough

Discover the hidden singing vortigaunt cave in chapter Water Hazard.
Unlocked 18 Dec, 2014 @ 11:28pm

Revenge!

Destroy the hunter-chopper in Half-Life 2.
Unlocked 11 May, 2012 @ 6:16pm

Blast from the Past

Find the HEV Suit Charger faceplate in Eli's scrapyard.
Unlocked 12 May, 2012 @ 5:17pm

Zero-Point Energy

Get the Gravity Gun in Black Mesa East.
Unlocked 12 May, 2012 @ 5:18pm

Two Points

Use DOG's ball to make a basket in Eli's scrapyard.
Unlocked 12 May, 2012 @ 5:21pm

Zombie Chopper

Play through Ravenholm using only the Gravity Gun.
Unlocked 12 May, 2012 @ 6:09pm

Hallowed Ground

Escort Gregori safely through the church cemetery.
Unlocked 12 May, 2012 @ 6:04pm

OSHA Violation

Kill 3 enemies using the crane.
Unlocked 14 May, 2012 @ 3:30pm

Targetted Advertising

Pin a soldier to the billboard in chapter Highway 17.
Unlocked 19 Dec, 2014 @ 12:52am

Where Cubbage Fears to Tread

Defend Little Odessa from the gunship attack.
Unlocked 14 May, 2012 @ 3:24pm

One Man Army

Destroy six gunships in Half-Life 2.
Unlocked 14 May, 2012 @ 4:48pm

Keep Off the Sand!

Cross the antlion beach in chapter Sandtraps without touching the sand.
Unlocked 14 May, 2012 @ 4:25pm

Bug Hunt

Use the antlions to kill 50 enemies.
Unlocked 14 May, 2012 @ 4:46pm

Warden Freeman

Survive the second turret standoff in Nova Prospekt.
Unlocked 14 May, 2012 @ 5:46pm

Follow Freeman

Gain command of a squad of rebels in the uprising.
Unlocked 14 May, 2012 @ 6:02pm

Radiation Levels Detected

Get through the toxic tunnel under City 17 in Half-Life 2.
Unlocked 14 May, 2012 @ 6:22pm

Plaza Defender

Survive the generator plaza standoff in chapter Anticitizen One.
Unlocked 14 May, 2012 @ 10:10pm

Counter-Sniper

Kill all of the snipers in City 17.
Unlocked 14 May, 2012 @ 10:32pm

Fight the Power

Shut down the supression device by disabling its generators.
Unlocked 14 May, 2012 @ 10:48pm

Giant Killer

Survive the rooftop strider battle in the ruins of City 17.
Unlocked 14 May, 2012 @ 11:12pm

Atomizer

Disintegrate 15 soldiers by throwing them into a Combine ball field.
Unlocked 14 May, 2012 @ 11:22pm

Singularity Collapse

Destroy the Citadel's reactor core.
Unlocked 14 May, 2012 @ 11:42pm

Watch Your Head!

Make it to the bottom of the Citadel's main elevator shaft in one piece.
Unlocked 18 Nov @ 3:39am

Containment

Contain the Citadel core.
Unlocked 18 Nov @ 3:46am

Elevator Action

Survive long enough to get on the parking garage elevator.
Unlocked 18 Nov @ 4:11am

Attica!

Destroy the gunship in the hospital attic.
Unlocked 19 Nov @ 1:15am

Citizen Escort

Don't let any citizens die when escorting them to the escape train.
Unlocked 19 Nov @ 1:38am

Escape From City 17

Escape City 17 with Alyx.
Unlocked 19 Nov @ 1:44am

Acid Reflex

Kill an acid antlion worker.
Unlocked 24 Nov @ 1:03am

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 24 Nov @ 1:20am

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 24 Nov @ 1:55am

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 24 Nov @ 2:29am

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 24 Nov @ 2:57am

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 24 Nov @ 3:08am

Payback

Kill a Hunter with its own flechettes.
Unlocked 24 Nov @ 2:29am

Bone Breaker

Kill 30 enemies with thrown physics objects.
Unlocked 24 Nov @ 3:08am

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 24 Nov @ 1:11am

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 19 Nov @ 1:45am



Flushed

Kill an enemy with a toilet.

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.

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.

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.

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.

Hot Potat0wned

Kill a Combine soldier with his own grenade.

Grave Robber

Steal a Zombine's grenade.