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

Defiant

Hit the trashcan cop with the can.
Unlocked 5 Apr, 2020 @ 8:49pm

Submissive

Put the can in the trash.
Unlocked 31 Dec, 2016 @ 4:56pm

Malcontent

Escape the apartment block raid.
Unlocked 31 Dec, 2016 @ 5:05pm

What cat?

Break the mini-teleporter in Kleiner's lab.
Unlocked 10 Jan, 2017 @ 4:40pm

Trusty Hardware

Get the crowbar.
Unlocked 31 Dec, 2016 @ 5:18pm

Barnacle Bowling

Kill five barnacles with one barrel.
Unlocked 5 Apr, 2020 @ 9:25pm

Anchor's Aweigh!

Get the airboat.
Unlocked 31 Dec, 2016 @ 6:55pm

Heavy Weapons

Get the airboat's mounted gun.
Unlocked 31 Dec, 2016 @ 8:05pm

Vorticough

Discover the hidden singing vortigaunt cave in chapter Water Hazard.
Unlocked 6 Apr, 2020 @ 2:17am

Revenge!

Destroy the hunter-chopper in Half-Life 2.
Unlocked 31 Dec, 2016 @ 8:47pm

Blast from the Past

Find the HEV Suit Charger faceplate in Eli's scrapyard.
Unlocked 10 Jan, 2017 @ 5:38pm

Zero-Point Energy

Get the Gravity Gun in Black Mesa East.
Unlocked 31 Dec, 2016 @ 9:31pm

Two Points

Use DOG's ball to make a basket in Eli's scrapyard.
Unlocked 10 Jan, 2017 @ 5:48pm

Zombie Chopper

Play through Ravenholm using only the Gravity Gun.
Unlocked 9 Apr, 2020 @ 6:43am

Hallowed Ground

Escort Gregori safely through the church cemetery.
Unlocked 31 Dec, 2016 @ 11:06pm

OSHA Violation

Kill 3 enemies using the crane.
Unlocked 3 Jan, 2017 @ 12:05am

Targetted Advertising

Pin a soldier to the billboard in chapter Highway 17.
Unlocked 10 Jan, 2017 @ 5:05pm

Where Cubbage Fears to Tread

Defend Little Odessa from the gunship attack.
Unlocked 10 Jan, 2017 @ 4:56pm

One Man Army

Destroy six gunships in Half-Life 2.
Unlocked 9 Apr, 2020 @ 9:19am

Keep Off the Sand!

Cross the antlion beach in chapter Sandtraps without touching the sand.
Unlocked 9 Apr, 2020 @ 8:49am

Bug Hunt

Use the antlions to kill 50 enemies.
Unlocked 3 Jan, 2017 @ 3:09pm

Flushed

Kill an enemy with a toilet.
Unlocked 9 Apr, 2020 @ 9:37am

Warden Freeman

Survive the second turret standoff in Nova Prospekt.
Unlocked 3 Jan, 2017 @ 6:42pm

Follow Freeman

Gain command of a squad of rebels in the uprising.
Unlocked 3 Jan, 2017 @ 7:11pm

Radiation Levels Detected

Get through the toxic tunnel under City 17 in Half-Life 2.
Unlocked 3 Jan, 2017 @ 8:06pm

Plaza Defender

Survive the generator plaza standoff in chapter Anticitizen One.
Unlocked 3 Jan, 2017 @ 8:58pm

Counter-Sniper

Kill all of the snipers in City 17.
Unlocked 3 Jan, 2017 @ 10:16pm

Fight the Power

Shut down the supression device by disabling its generators.
Unlocked 3 Jan, 2017 @ 11:04pm

Giant Killer

Survive the rooftop strider battle in the ruins of City 17.
Unlocked 4 Jan, 2017 @ 12:20am

Atomizer

Disintegrate 15 soldiers by throwing them into a Combine ball field.
Unlocked 4 Jan, 2017 @ 12:55am

Singularity Collapse

Destroy the Citadel's reactor core.
Unlocked 9 Apr, 2020 @ 4:34pm

Lambda Locator

Find all lambda caches in Half-Life 2.
Unlocked 9 Apr, 2020 @ 3:32pm

Hack Attack!

Kill five enemies with a Manhack.
Unlocked 9 Apr, 2020 @ 9:48am

Watch Your Head!

Make it to the bottom of the Citadel's main elevator shaft in one piece.
Unlocked 11 Dec @ 5:13pm

Containment

Contain the Citadel core.
Unlocked 11 Dec @ 5:13pm

Pacifist

Contain the Citadel core without killing any stalkers.
Unlocked 11 Dec @ 5:13pm

Car Crusher

Use the cars to squash 15 antlions in Episode One.
Unlocked 11 Dec @ 5:13pm

Elevator Action

Survive long enough to get on the parking garage elevator.
Unlocked 11 Dec @ 5:13pm

Live Bait

Help Alyx snipe 30 enemies in Episode One.
Unlocked 11 Dec @ 5:13pm

Attica!

Destroy the gunship in the hospital attic.
Unlocked 11 Dec @ 5:13pm

Citizen Escort

Don't let any citizens die when escorting them to the escape train.
Unlocked 11 Dec @ 5:13pm

Escape From City 17

Escape City 17 with Alyx.
Unlocked 11 Dec @ 5:13pm

The One Free Bullet

Finish the game firing exactly one bullet. Grenade, crowbar, rocket, and Gravity Gun kills are okay!
Unlocked 11 Dec @ 5:13pm

Conservationist

Kill five enemies with the same energy ball.
Unlocked 11 Dec @ 5:13pm

Think Fast!

Kill an Elite Soldier with his own energy ball.
Unlocked 11 Dec @ 5:13pm

Zombie-que

Use flares to light 15 zombies on fire.
Unlocked 11 Dec @ 5:13pm

Acid Reflex

Kill an acid antlion worker.
Unlocked 11 Dec @ 5:13pm

Get Some Grub

Squish every antlion grub in Episode Two.
Unlocked 11 Dec @ 5:13pm

Piñata Party

Find and break every web cache in Episode Two.
Unlocked 11 Dec @ 5:13pm

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 11 Dec @ 5:13pm

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 11 Dec @ 5:13pm

Hit and Run

Run over 20 enemies with the car in Episode Two.
Unlocked 11 Dec @ 5:13pm

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 11 Dec @ 5:13pm

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.
Unlocked 11 Dec @ 5:13pm

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 11 Dec @ 5:13pm

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 11 Dec @ 5:13pm

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked 11 Dec @ 5:13pm

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 11 Dec @ 5:13pm

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 11 Dec @ 5:13pm

Little Rocket Man

Send the garden gnome into space.
Unlocked 11 Dec @ 5:13pm

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 11 Dec @ 5:13pm

Neighborhood Watch

Save all buildings outside the missile silo from destruction.
Unlocked 11 Dec @ 5:13pm

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 11 Dec @ 5:13pm

Payback

Kill a Hunter with its own flechettes.
Unlocked 11 Dec @ 5:13pm

Bone Breaker

Kill 30 enemies with thrown physics objects.
Unlocked 11 Dec @ 5:13pm

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 11 Dec @ 5:13pm

Hot Potat0wned

Kill a Combine soldier with his own grenade.
Unlocked 11 Dec @ 5:13pm

Grave Robber

Steal a Zombine's grenade.
Unlocked 11 Dec @ 5:13pm

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 11 Dec @ 5:13pm