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66 of 69 (96%) achievements earned:
Personal Achievements
 

Defiant

Hit the trashcan cop with the can.
Unlocked 7 Jan, 2019 @ 11:08am

Submissive

Put the can in the trash.
Unlocked 7 Jan, 2019 @ 11:08am

Malcontent

Escape the apartment block raid.
Unlocked 7 Jan, 2019 @ 11:19am

What cat?

Break the mini-teleporter in Kleiner's lab.
Unlocked 11 Jan, 2019 @ 10:32pm

Trusty Hardware

Get the crowbar.
Unlocked 7 Jan, 2019 @ 11:31am

Barnacle Bowling

Kill five barnacles with one barrel.
Unlocked 7 Jan, 2019 @ 11:54am

Anchor's Aweigh!

Get the airboat.
Unlocked 7 Jan, 2019 @ 12:45pm

Heavy Weapons

Get the airboat's mounted gun.
Unlocked 8 Jan, 2019 @ 7:39pm

Vorticough

Discover the hidden singing vortigaunt cave in chapter Water Hazard.
Unlocked 12 Jan, 2019 @ 8:31pm

Revenge!

Destroy the hunter-chopper in Half-Life 2.
Unlocked 8 Jan, 2019 @ 7:51pm

Blast from the Past

Find the HEV Suit Charger faceplate in Eli's scrapyard.
Unlocked 9 Jan, 2019 @ 4:09pm

Zero-Point Energy

Get the Gravity Gun in Black Mesa East.
Unlocked 9 Jan, 2019 @ 4:05pm

Two Points

Use DOG's ball to make a basket in Eli's scrapyard.
Unlocked 12 Jan, 2019 @ 8:52pm

Zombie Chopper

Play through Ravenholm using only the Gravity Gun.
Unlocked 29 Jun, 2019 @ 1:42pm

Hallowed Ground

Escort Gregori safely through the church cemetery.
Unlocked 9 Jan, 2019 @ 5:45pm

OSHA Violation

Kill 3 enemies using the crane.
Unlocked 9 Jan, 2019 @ 9:18pm

Targetted Advertising

Pin a soldier to the billboard in chapter Highway 17.
Unlocked 9 Jan, 2019 @ 9:30pm

Where Cubbage Fears to Tread

Defend Little Odessa from the gunship attack.
Unlocked 9 Jan, 2019 @ 9:08pm

One Man Army

Destroy six gunships in Half-Life 2.
Unlocked 10 Jan, 2019 @ 12:33pm

Keep Off the Sand!

Cross the antlion beach in chapter Sandtraps without touching the sand.
Unlocked 29 Jun, 2019 @ 2:59pm

Bug Hunt

Use the antlions to kill 50 enemies.
Unlocked 10 Jan, 2019 @ 12:28pm

Flushed

Kill an enemy with a toilet.
Unlocked 10 Jan, 2019 @ 12:44pm

Warden Freeman

Survive the second turret standoff in Nova Prospekt.
Unlocked 11 Jan, 2019 @ 10:17pm

Follow Freeman

Gain command of a squad of rebels in the uprising.
Unlocked 12 Jan, 2019 @ 12:18pm

Radiation Levels Detected

Get through the toxic tunnel under City 17 in Half-Life 2.
Unlocked 12 Jan, 2019 @ 1:08pm

Plaza Defender

Survive the generator plaza standoff in chapter Anticitizen One.
Unlocked 12 Jan, 2019 @ 1:37pm

Counter-Sniper

Kill all of the snipers in City 17.
Unlocked 12 Jan, 2019 @ 2:10pm

Fight the Power

Shut down the supression device by disabling its generators.
Unlocked 12 Jan, 2019 @ 2:43pm

Giant Killer

Survive the rooftop strider battle in the ruins of City 17.
Unlocked 12 Jan, 2019 @ 6:12pm

Atomizer

Disintegrate 15 soldiers by throwing them into a Combine ball field.
Unlocked 12 Jan, 2019 @ 6:29pm

Singularity Collapse

Destroy the Citadel's reactor core.
Unlocked 12 Jan, 2019 @ 7:49pm

Lambda Locator

Find all lambda caches in Half-Life 2.
Unlocked 15 Apr, 2020 @ 4:58pm

Hack Attack!

Kill five enemies with a Manhack.
Unlocked 11 Jan, 2019 @ 10:16pm

Watch Your Head!

Make it to the bottom of the Citadel's main elevator shaft in one piece.
Unlocked 29 Nov @ 6:19pm

Containment

Contain the Citadel core.
Unlocked 29 Nov @ 8:06pm

Pacifist

Contain the Citadel core without killing any stalkers.
Unlocked 29 Nov @ 8:06pm

Car Crusher

Use the cars to squash 15 antlions in Episode One.
Unlocked 29 Nov @ 8:27pm

Elevator Action

Survive long enough to get on the parking garage elevator.
Unlocked 29 Nov @ 8:44pm

Live Bait

Help Alyx snipe 30 enemies in Episode One.
Unlocked 29 Nov @ 9:04pm

Attica!

Destroy the gunship in the hospital attic.
Unlocked 30 Nov @ 1:02pm

Citizen Escort

Don't let any citizens die when escorting them to the escape train.
Unlocked 30 Nov @ 1:33pm

Escape From City 17

Escape City 17 with Alyx.
Unlocked 30 Nov @ 1:39pm

Conservationist

Kill five enemies with the same energy ball.
Unlocked 2 Dec @ 8:19pm

Think Fast!

Kill an Elite Soldier with his own energy ball.
Unlocked 29 Nov @ 6:23pm

Zombie-que

Use flares to light 15 zombies on fire.
Unlocked 29 Nov @ 8:42pm

Acid Reflex

Kill an acid antlion worker.
Unlocked 30 Nov @ 2:16pm

Get Some Grub

Squish every antlion grub in Episode Two.
Unlocked 30 Nov @ 3:33pm

Piñata Party

Find and break every web cache in Episode Two.
Unlocked 30 Nov @ 3:22pm

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 30 Nov @ 2:43pm

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 30 Nov @ 3:41pm

Hit and Run

Run over 20 enemies with the car in Episode Two.
Unlocked 30 Nov @ 6:37pm

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 30 Nov @ 4:12pm

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.
Unlocked 30 Nov @ 4:24pm

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 30 Nov @ 4:33pm

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 30 Nov @ 4:52pm

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked 30 Nov @ 4:56pm

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 30 Nov @ 4:36pm

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 30 Nov @ 4:49pm

Little Rocket Man

Send the garden gnome into space.
Unlocked 30 Nov @ 5:12pm

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 30 Nov @ 6:10pm

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 30 Nov @ 6:40pm

Payback

Kill a Hunter with its own flechettes.
Unlocked 30 Nov @ 4:12pm

Bone Breaker

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

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 30 Nov @ 2:31pm

Grave Robber

Steal a Zombine's grenade.
Unlocked 30 Nov @ 2:02pm

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 @ 11:47pm



The One Free Bullet

Finish the game firing exactly one bullet. Grenade, crowbar, rocket, and Gravity Gun kills are okay!

Neighborhood Watch

Save all buildings outside the missile silo from destruction.

Hot Potat0wned

Kill a Combine soldier with his own grenade.