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

Defiant

Hit the trashcan cop with the can.
Unlocked 28 Feb, 2016 @ 7:01am

Submissive

Put the can in the trash.
Unlocked 23 Jun, 2015 @ 4:11am

Malcontent

Escape the apartment block raid.
Unlocked 23 Jun, 2015 @ 4:23am

What cat?

Break the mini-teleporter in Kleiner's lab.
Unlocked 15 Nov, 2015 @ 8:17am

Trusty Hardware

Get the crowbar.
Unlocked 23 Jun, 2015 @ 5:07am

Barnacle Bowling

Kill five barnacles with one barrel.
Unlocked 26 Jun, 2015 @ 12:51am

Anchor's Aweigh!

Get the airboat.
Unlocked 18 Jul, 2015 @ 2:37am

Heavy Weapons

Get the airboat's mounted gun.
Unlocked 18 Jul, 2015 @ 3:20am

Vorticough

Discover the hidden singing vortigaunt cave in chapter Water Hazard.
Unlocked 5 Mar, 2016 @ 5:35am

Revenge!

Destroy the hunter-chopper in Half-Life 2.
Unlocked 21 Jul, 2015 @ 10:38am

Blast from the Past

Find the HEV Suit Charger faceplate in Eli's scrapyard.
Unlocked 21 Jul, 2015 @ 11:09am

Zero-Point Energy

Get the Gravity Gun in Black Mesa East.
Unlocked 21 Jul, 2015 @ 11:07am

Two Points

Use DOG's ball to make a basket in Eli's scrapyard.
Unlocked 7 May, 2018 @ 8:46am

Zombie Chopper

Play through Ravenholm using only the Gravity Gun.
Unlocked 7 May, 2018 @ 9:11am

Hallowed Ground

Escort Gregori safely through the church cemetery.
Unlocked 12 Mar, 2016 @ 6:09am

OSHA Violation

Kill 3 enemies using the crane.
Unlocked 4 Jun, 2016 @ 4:39am

Targetted Advertising

Pin a soldier to the billboard in chapter Highway 17.
Unlocked 4 Jun, 2016 @ 4:56am

Where Cubbage Fears to Tread

Defend Little Odessa from the gunship attack.
Unlocked 4 Jun, 2016 @ 4:35am

One Man Army

Destroy six gunships in Half-Life 2.
Unlocked 4 Jun, 2016 @ 10:32am

Keep Off the Sand!

Cross the antlion beach in chapter Sandtraps without touching the sand.
Unlocked 10 Feb, 2020 @ 12:39pm

Bug Hunt

Use the antlions to kill 50 enemies.
Unlocked 4 Jun, 2016 @ 10:53am

Flushed

Kill an enemy with a toilet.
Unlocked 10 Feb, 2020 @ 11:20am

Warden Freeman

Survive the second turret standoff in Nova Prospekt.
Unlocked 5 Jun, 2016 @ 2:59am

Follow Freeman

Gain command of a squad of rebels in the uprising.
Unlocked 5 Jun, 2016 @ 3:20am

Radiation Levels Detected

Get through the toxic tunnel under City 17 in Half-Life 2.
Unlocked 5 Jun, 2016 @ 3:41am

Plaza Defender

Survive the generator plaza standoff in chapter Anticitizen One.
Unlocked 5 Jun, 2016 @ 4:14am

Counter-Sniper

Kill all of the snipers in City 17.
Unlocked 27 Apr, 2018 @ 12:28pm

Fight the Power

Shut down the supression device by disabling its generators.
Unlocked 5 Jun, 2016 @ 6:21am

Giant Killer

Survive the rooftop strider battle in the ruins of City 17.
Unlocked 5 Jun, 2016 @ 6:58am

Atomizer

Disintegrate 15 soldiers by throwing them into a Combine ball field.
Unlocked 5 Jun, 2016 @ 7:09am

Singularity Collapse

Destroy the Citadel's reactor core.
Unlocked 5 Jun, 2016 @ 7:34am

Lambda Locator

Find all lambda caches in Half-Life 2.
Unlocked 11 Feb, 2020 @ 12:17pm

Hack Attack!

Kill five enemies with a Manhack.
Unlocked 5 Jun, 2016 @ 7:10am

Watch Your Head!

Make it to the bottom of the Citadel's main elevator shaft in one piece.
Unlocked 16 Nov @ 4:48am

Containment

Contain the Citadel core.
Unlocked 16 Nov @ 5:34am

Pacifist

Contain the Citadel core without killing any stalkers.
Unlocked 16 Nov @ 5:34am

Car Crusher

Use the cars to squash 15 antlions in Episode One.
Unlocked 16 Nov @ 9:59am

Elevator Action

Survive long enough to get on the parking garage elevator.
Unlocked 16 Nov @ 10:05am

Live Bait

Help Alyx snipe 30 enemies in Episode One.
Unlocked 16 Nov @ 10:14am

Attica!

Destroy the gunship in the hospital attic.
Unlocked 16 Nov @ 10:33am

Citizen Escort

Don't let any citizens die when escorting them to the escape train.
Unlocked 16 Nov @ 10:51am

Escape From City 17

Escape City 17 with Alyx.
Unlocked 16 Nov @ 10:55am

The One Free Bullet

Finish the game firing exactly one bullet. Grenade, crowbar, rocket, and Gravity Gun kills are okay!
Unlocked 17 Nov @ 4:06am

Conservationist

Kill five enemies with the same energy ball.
Unlocked 27 Nov @ 12:48pm

Think Fast!

Kill an Elite Soldier with his own energy ball.
Unlocked 27 Nov @ 12:44pm

Zombie-que

Use flares to light 15 zombies on fire.
Unlocked 16 Nov @ 10:39am

Acid Reflex

Kill an acid antlion worker.
Unlocked 17 Nov @ 4:24am

Get Some Grub

Squish every antlion grub in Episode Two.
Unlocked 24 Nov @ 2:29pm

Piñata Party

Find and break every web cache in Episode Two.
Unlocked 28 Nov @ 11:54am

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 17 Nov @ 9:04am

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 20 Nov @ 10:15am

Hit and Run

Run over 20 enemies with the car in Episode Two.
Unlocked 28 Nov @ 11:49am

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 20 Nov @ 10:43am

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.
Unlocked 20 Nov @ 11:10am

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 21 Nov @ 11:17am

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 21 Nov @ 11:40am

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked 21 Nov @ 11:46am

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 21 Nov @ 11:22am

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 21 Nov @ 11:36am

Little Rocket Man

Send the garden gnome into space.
Unlocked 21 Nov @ 11:52am

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 21 Nov @ 12:00pm

Neighborhood Watch

Save all buildings outside the missile silo from destruction.
Unlocked 22 Nov @ 1:23pm

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 22 Nov @ 1:23pm

Payback

Kill a Hunter with its own flechettes.
Unlocked 20 Nov @ 10:42am

Bone Breaker

Kill 30 enemies with thrown physics objects.
Unlocked 20 Nov @ 10:28am

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 17 Nov @ 8:56am

Hot Potat0wned

Kill a Combine soldier with his own grenade.
Unlocked 21 Nov @ 11:58am

Grave Robber

Steal a Zombine's grenade.
Unlocked 17 Nov @ 9:11am

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 16 Nov @ 10:58am