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69 of 69 (100%) achievements earned:
Personal Achievements
 

Defiant

Hit the trashcan cop with the can.
Unlocked 29 Nov, 2014 @ 10:50am

Submissive

Put the can in the trash.
Unlocked 2 Mar, 2015 @ 11:56am

Malcontent

Escape the apartment block raid.
Unlocked 29 Nov, 2014 @ 10:57am

What cat?

Break the mini-teleporter in Kleiner's lab.
Unlocked 2 Dec, 2014 @ 3:56pm

Trusty Hardware

Get the crowbar.
Unlocked 29 Nov, 2014 @ 11:08am

Barnacle Bowling

Kill five barnacles with one barrel.
Unlocked 2 Mar, 2015 @ 12:26pm

Anchor's Aweigh!

Get the airboat.
Unlocked 29 Nov, 2014 @ 11:58am

Heavy Weapons

Get the airboat's mounted gun.
Unlocked 30 Nov, 2014 @ 6:18am

Vorticough

Discover the hidden singing vortigaunt cave in chapter Water Hazard.
Unlocked 3 Mar, 2015 @ 12:48pm

Revenge!

Destroy the hunter-chopper in Half-Life 2.
Unlocked 30 Nov, 2014 @ 6:31am

Blast from the Past

Find the HEV Suit Charger faceplate in Eli's scrapyard.
Unlocked 3 Mar, 2015 @ 5:39pm

Zero-Point Energy

Get the Gravity Gun in Black Mesa East.
Unlocked 30 Nov, 2014 @ 6:45am

Two Points

Use DOG's ball to make a basket in Eli's scrapyard.
Unlocked 8 Dec, 2016 @ 12:18pm

Zombie Chopper

Play through Ravenholm using only the Gravity Gun.
Unlocked 17 Dec, 2022 @ 5:02pm

Hallowed Ground

Escort Gregori safely through the church cemetery.
Unlocked 30 Nov, 2014 @ 11:11am

OSHA Violation

Kill 3 enemies using the crane.
Unlocked 30 Nov, 2014 @ 11:39am

Targetted Advertising

Pin a soldier to the billboard in chapter Highway 17.
Unlocked 7 Jan, 2017 @ 3:12pm

Where Cubbage Fears to Tread

Defend Little Odessa from the gunship attack.
Unlocked 30 Nov, 2014 @ 11:32am

One Man Army

Destroy six gunships in Half-Life 2.
Unlocked 4 Dec, 2014 @ 12:32pm

Keep Off the Sand!

Cross the antlion beach in chapter Sandtraps without touching the sand.
Unlocked 17 Dec, 2022 @ 6:11am

Bug Hunt

Use the antlions to kill 50 enemies.
Unlocked 1 Dec, 2014 @ 6:18pm

Flushed

Kill an enemy with a toilet.
Unlocked 1 Dec, 2014 @ 6:11pm

Warden Freeman

Survive the second turret standoff in Nova Prospekt.
Unlocked 2 Dec, 2014 @ 3:40pm

Follow Freeman

Gain command of a squad of rebels in the uprising.
Unlocked 2 Dec, 2014 @ 4:00pm

Radiation Levels Detected

Get through the toxic tunnel under City 17 in Half-Life 2.
Unlocked 17 Dec, 2022 @ 8:13am

Plaza Defender

Survive the generator plaza standoff in chapter Anticitizen One.
Unlocked 4 Dec, 2014 @ 11:57am

Counter-Sniper

Kill all of the snipers in City 17.
Unlocked 4 Dec, 2014 @ 12:12pm

Fight the Power

Shut down the supression device by disabling its generators.
Unlocked 4 Dec, 2014 @ 12:30pm

Giant Killer

Survive the rooftop strider battle in the ruins of City 17.
Unlocked 4 Dec, 2014 @ 12:53pm

Atomizer

Disintegrate 15 soldiers by throwing them into a Combine ball field.
Unlocked 17 Dec, 2022 @ 5:32am

Singularity Collapse

Destroy the Citadel's reactor core.
Unlocked 4 Dec, 2014 @ 1:35pm

Lambda Locator

Find all lambda caches in Half-Life 2.
Unlocked 18 Dec, 2022 @ 5:18am

Hack Attack!

Kill five enemies with a Manhack.
Unlocked 17 Dec, 2022 @ 8:11am

Watch Your Head!

Make it to the bottom of the Citadel's main elevator shaft in one piece.
Unlocked 17 Nov @ 4:20am

Containment

Contain the Citadel core.
Unlocked 17 Nov @ 4:20am

Pacifist

Contain the Citadel core without killing any stalkers.
Unlocked 17 Nov @ 4:20am

Car Crusher

Use the cars to squash 15 antlions in Episode One.
Unlocked 17 Nov @ 4:20am

Elevator Action

Survive long enough to get on the parking garage elevator.
Unlocked 17 Nov @ 4:20am

Live Bait

Help Alyx snipe 30 enemies in Episode One.
Unlocked 17 Nov @ 4:20am

Attica!

Destroy the gunship in the hospital attic.
Unlocked 17 Nov @ 4:20am

Citizen Escort

Don't let any citizens die when escorting them to the escape train.
Unlocked 17 Nov @ 4:20am

Escape From City 17

Escape City 17 with Alyx.
Unlocked 17 Nov @ 4:20am

The One Free Bullet

Finish the game firing exactly one bullet. Grenade, crowbar, rocket, and Gravity Gun kills are okay!
Unlocked 17 Nov @ 4:20am

Conservationist

Kill five enemies with the same energy ball.
Unlocked 17 Nov @ 4:20am

Think Fast!

Kill an Elite Soldier with his own energy ball.
Unlocked 17 Nov @ 4:20am

Zombie-que

Use flares to light 15 zombies on fire.
Unlocked 17 Nov @ 4:20am

Acid Reflex

Kill an acid antlion worker.
Unlocked 17 Nov @ 4:20am

Get Some Grub

Squish every antlion grub in Episode Two.
Unlocked 17 Nov @ 4:20am

Piñata Party

Find and break every web cache in Episode Two.
Unlocked 17 Nov @ 4:20am

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 17 Nov @ 4:20am

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 17 Nov @ 4:20am

Hit and Run

Run over 20 enemies with the car in Episode Two.
Unlocked 17 Nov @ 4:20am

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 17 Nov @ 4:20am

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.
Unlocked 17 Nov @ 4:20am

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 17 Nov @ 4:20am

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 17 Nov @ 4:20am

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked 17 Nov @ 4:20am

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 17 Nov @ 4:20am

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 17 Nov @ 4:20am

Little Rocket Man

Send the garden gnome into space.
Unlocked 17 Nov @ 4:20am

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 17 Nov @ 4:20am

Neighborhood Watch

Save all buildings outside the missile silo from destruction.
Unlocked 17 Nov @ 4:20am

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 17 Nov @ 4:20am

Payback

Kill a Hunter with its own flechettes.
Unlocked 17 Nov @ 4:20am

Bone Breaker

Kill 30 enemies with thrown physics objects.
Unlocked 17 Nov @ 4:20am

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 17 Nov @ 4:20am

Hot Potat0wned

Kill a Combine soldier with his own grenade.
Unlocked 17 Nov @ 4:20am

Grave Robber

Steal a Zombine's grenade.
Unlocked 17 Nov @ 4:20am

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 17 Nov @ 4:20am