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

Defiant

Hit the trashcan cop with the can.
Unlocked 26 Nov, 2013 @ 6:02am

Submissive

Put the can in the trash.
Unlocked 25 Sep, 2010 @ 6:29am

Malcontent

Escape the apartment block raid.
Unlocked 25 Sep, 2010 @ 6:40am

What cat?

Break the mini-teleporter in Kleiner's lab.
Unlocked 25 Sep, 2010 @ 6:48am

Trusty Hardware

Get the crowbar.
Unlocked 25 Sep, 2010 @ 6:54am

Barnacle Bowling

Kill five barnacles with one barrel.
Unlocked 25 Sep, 2010 @ 7:15am

Anchor's Aweigh!

Get the airboat.
Unlocked 29 Oct, 2010 @ 4:54am

Heavy Weapons

Get the airboat's mounted gun.
Unlocked 19 Dec, 2010 @ 4:41am

Vorticough

Discover the hidden singing vortigaunt cave in chapter Water Hazard.
Unlocked 19 Dec, 2010 @ 5:04am

Revenge!

Destroy the hunter-chopper in Half-Life 2.
Unlocked 19 Dec, 2010 @ 5:02am

Blast from the Past

Find the HEV Suit Charger faceplate in Eli's scrapyard.
Unlocked 19 Dec, 2010 @ 5:18am

Zero-Point Energy

Get the Gravity Gun in Black Mesa East.
Unlocked 19 Dec, 2010 @ 5:18am

Two Points

Use DOG's ball to make a basket in Eli's scrapyard.
Unlocked 31 Dec, 2010 @ 4:49am

Zombie Chopper

Play through Ravenholm using only the Gravity Gun.
Unlocked 5 Feb, 2012 @ 6:26am

Hallowed Ground

Escort Gregori safely through the church cemetery.
Unlocked 5 Jan, 2012 @ 9:19am

OSHA Violation

Kill 3 enemies using the crane.
Unlocked 5 Jan, 2011 @ 6:19am

Targetted Advertising

Pin a soldier to the billboard in chapter Highway 17.
Unlocked 7 Feb, 2012 @ 8:45am

Where Cubbage Fears to Tread

Defend Little Odessa from the gunship attack.
Unlocked 7 Feb, 2012 @ 8:19am

One Man Army

Destroy six gunships in Half-Life 2.
Unlocked 11 May, 2013 @ 3:31am

Keep Off the Sand!

Cross the antlion beach in chapter Sandtraps without touching the sand.
Unlocked 2 Mar, 2012 @ 9:05pm

Bug Hunt

Use the antlions to kill 50 enemies.
Unlocked 5 Feb, 2012 @ 12:03am

Flushed

Kill an enemy with a toilet.
Unlocked 6 Feb, 2012 @ 11:52am

Warden Freeman

Survive the second turret standoff in Nova Prospekt.
Unlocked 5 Feb, 2012 @ 10:13am

Follow Freeman

Gain command of a squad of rebels in the uprising.
Unlocked 15 Feb, 2011 @ 8:55am

Radiation Levels Detected

Get through the toxic tunnel under City 17 in Half-Life 2.
Unlocked 16 Feb, 2011 @ 5:26am

Plaza Defender

Survive the generator plaza standoff in chapter Anticitizen One.
Unlocked 6 Feb, 2012 @ 5:22am

Counter-Sniper

Kill all of the snipers in City 17.
Unlocked 12 Jan, 2013 @ 2:52am

Fight the Power

Shut down the supression device by disabling its generators.
Unlocked 6 Feb, 2012 @ 6:10am

Giant Killer

Survive the rooftop strider battle in the ruins of City 17.
Unlocked 6 Feb, 2012 @ 6:48am

Atomizer

Disintegrate 15 soldiers by throwing them into a Combine ball field.
Unlocked 6 Feb, 2012 @ 11:13am

Singularity Collapse

Destroy the Citadel's reactor core.
Unlocked 11 May, 2013 @ 7:41am

Lambda Locator

Find all lambda caches in Half-Life 2.
Unlocked 11 May, 2013 @ 7:02am

Hack Attack!

Kill five enemies with a Manhack.
Unlocked 5 Feb, 2012 @ 10:13am

Watch Your Head!

Make it to the bottom of the Citadel's main elevator shaft in one piece.
Unlocked 8 Dec, 2024 @ 4:43am

Containment

Contain the Citadel core.
Unlocked 8 Dec, 2024 @ 4:43am

Pacifist

Contain the Citadel core without killing any stalkers.
Unlocked 8 Dec, 2024 @ 4:43am

Car Crusher

Use the cars to squash 15 antlions in Episode One.
Unlocked 8 Dec, 2024 @ 4:43am

Elevator Action

Survive long enough to get on the parking garage elevator.
Unlocked 8 Dec, 2024 @ 4:43am

Live Bait

Help Alyx snipe 30 enemies in Episode One.
Unlocked 8 Dec, 2024 @ 4:43am

Attica!

Destroy the gunship in the hospital attic.
Unlocked 8 Dec, 2024 @ 4:43am

Citizen Escort

Don't let any citizens die when escorting them to the escape train.
Unlocked 8 Dec, 2024 @ 4:43am

Escape From City 17

Escape City 17 with Alyx.
Unlocked 8 Dec, 2024 @ 4:43am

The One Free Bullet

Finish the game firing exactly one bullet. Grenade, crowbar, rocket, and Gravity Gun kills are okay!
Unlocked 8 Dec, 2024 @ 4:43am

Conservationist

Kill five enemies with the same energy ball.
Unlocked 8 Dec, 2024 @ 4:43am

Think Fast!

Kill an Elite Soldier with his own energy ball.
Unlocked 8 Dec, 2024 @ 4:43am

Zombie-que

Use flares to light 15 zombies on fire.
Unlocked 8 Dec, 2024 @ 4:43am

Acid Reflex

Kill an acid antlion worker.
Unlocked 8 Dec, 2024 @ 4:43am

Get Some Grub

Squish every antlion grub in Episode Two.
Unlocked 8 Dec, 2024 @ 4:43am

Piñata Party

Find and break every web cache in Episode Two.
Unlocked 8 Dec, 2024 @ 4:43am

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 8 Dec, 2024 @ 4:43am

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 8 Dec, 2024 @ 4:43am

Hit and Run

Run over 20 enemies with the car in Episode Two.
Unlocked 8 Dec, 2024 @ 4:43am

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 8 Dec, 2024 @ 4:43am

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.
Unlocked 8 Dec, 2024 @ 4:43am

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 8 Dec, 2024 @ 4:43am

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 8 Dec, 2024 @ 4:43am

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked 8 Dec, 2024 @ 4:43am

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 8 Dec, 2024 @ 4:43am

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 8 Dec, 2024 @ 4:43am

Little Rocket Man

Send the garden gnome into space.
Unlocked 8 Dec, 2024 @ 4:43am

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 8 Dec, 2024 @ 4:43am

Neighborhood Watch

Save all buildings outside the missile silo from destruction.
Unlocked 8 Dec, 2024 @ 4:43am

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 8 Dec, 2024 @ 4:43am

Payback

Kill a Hunter with its own flechettes.
Unlocked 8 Dec, 2024 @ 4:43am

Bone Breaker

Kill 30 enemies with thrown physics objects.
Unlocked 8 Dec, 2024 @ 4:43am

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 8 Dec, 2024 @ 4:43am

Hot Potat0wned

Kill a Combine soldier with his own grenade.
Unlocked 8 Dec, 2024 @ 4:43am

Grave Robber

Steal a Zombine's grenade.
Unlocked 8 Dec, 2024 @ 4:43am

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 8 Dec, 2024 @ 4:43am