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

Defiant

Hit the trashcan cop with the can.
Unlocked 13 Jul, 2021 @ 5:45pm

Submissive

Put the can in the trash.
Unlocked 13 Jul, 2021 @ 5:45pm

Malcontent

Escape the apartment block raid.
Unlocked 13 Jul, 2021 @ 5:48pm

What cat?

Break the mini-teleporter in Kleiner's lab.
Unlocked 13 Jul, 2021 @ 5:53pm

Trusty Hardware

Get the crowbar.
Unlocked 13 Jul, 2021 @ 5:58pm

Barnacle Bowling

Kill five barnacles with one barrel.
Unlocked 13 Jul, 2021 @ 6:07pm

Anchor's Aweigh!

Get the airboat.
Unlocked 13 Jul, 2021 @ 6:19pm

Heavy Weapons

Get the airboat's mounted gun.
Unlocked 13 Jul, 2021 @ 6:46pm

Vorticough

Discover the hidden singing vortigaunt cave in chapter Water Hazard.
Unlocked 13 Jul, 2021 @ 6:56pm

Revenge!

Destroy the hunter-chopper in Half-Life 2.
Unlocked 13 Jul, 2021 @ 6:54pm

Blast from the Past

Find the HEV Suit Charger faceplate in Eli's scrapyard.
Unlocked 13 Jul, 2021 @ 7:10pm

Zero-Point Energy

Get the Gravity Gun in Black Mesa East.
Unlocked 13 Jul, 2021 @ 7:10pm

Two Points

Use DOG's ball to make a basket in Eli's scrapyard.
Unlocked 13 Jul, 2021 @ 7:20pm

Zombie Chopper

Play through Ravenholm using only the Gravity Gun.
Unlocked 13 Jul, 2021 @ 7:51pm

Hallowed Ground

Escort Gregori safely through the church cemetery.
Unlocked 13 Jul, 2021 @ 7:48pm

OSHA Violation

Kill 3 enemies using the crane.
Unlocked 13 Jul, 2021 @ 8:09pm

Targetted Advertising

Pin a soldier to the billboard in chapter Highway 17.
Unlocked 13 Jul, 2021 @ 8:15pm

Where Cubbage Fears to Tread

Defend Little Odessa from the gunship attack.
Unlocked 13 Jul, 2021 @ 8:05pm

One Man Army

Destroy six gunships in Half-Life 2.
Unlocked 14 Jul, 2021 @ 1:55am

Keep Off the Sand!

Cross the antlion beach in chapter Sandtraps without touching the sand.
Unlocked 13 Jul, 2021 @ 9:04pm

Bug Hunt

Use the antlions to kill 50 enemies.
Unlocked 13 Jul, 2021 @ 9:26pm

Flushed

Kill an enemy with a toilet.
Unlocked 13 Jul, 2021 @ 7:22pm

Warden Freeman

Survive the second turret standoff in Nova Prospekt.
Unlocked 13 Jul, 2021 @ 10:10pm

Follow Freeman

Gain command of a squad of rebels in the uprising.
Unlocked 13 Jul, 2021 @ 10:26pm

Radiation Levels Detected

Get through the toxic tunnel under City 17 in Half-Life 2.
Unlocked 13 Jul, 2021 @ 11:04pm

Plaza Defender

Survive the generator plaza standoff in chapter Anticitizen One.
Unlocked 13 Jul, 2021 @ 11:25pm

Counter-Sniper

Kill all of the snipers in City 17.
Unlocked 13 Jul, 2021 @ 11:38pm

Fight the Power

Shut down the supression device by disabling its generators.
Unlocked 13 Jul, 2021 @ 11:56pm

Giant Killer

Survive the rooftop strider battle in the ruins of City 17.
Unlocked 14 Jul, 2021 @ 12:20am

Atomizer

Disintegrate 15 soldiers by throwing them into a Combine ball field.
Unlocked 14 Jul, 2021 @ 12:30am

Singularity Collapse

Destroy the Citadel's reactor core.
Unlocked 14 Jul, 2021 @ 12:49am

Lambda Locator

Find all lambda caches in Half-Life 2.
Unlocked 14 Jul, 2021 @ 12:12am

Hack Attack!

Kill five enemies with a Manhack.
Unlocked 13 Jul, 2021 @ 10:10pm

Watch Your Head!

Make it to the bottom of the Citadel's main elevator shaft in one piece.
Unlocked 17 Nov @ 7:31am

Containment

Contain the Citadel core.
Unlocked 17 Nov @ 7:42am

Pacifist

Contain the Citadel core without killing any stalkers.
Unlocked 17 Nov @ 7:42am

Car Crusher

Use the cars to squash 15 antlions in Episode One.
Unlocked 17 Nov @ 8:01am

Elevator Action

Survive long enough to get on the parking garage elevator.
Unlocked 17 Nov @ 8:09am

Live Bait

Help Alyx snipe 30 enemies in Episode One.
Unlocked 17 Nov @ 8:21am

Attica!

Destroy the gunship in the hospital attic.
Unlocked 18 Nov @ 10:19am

Citizen Escort

Don't let any citizens die when escorting them to the escape train.
Unlocked 18 Nov @ 10:45am

Escape From City 17

Escape City 17 with Alyx.
Unlocked 18 Nov @ 10:50am

The One Free Bullet

Finish the game firing exactly one bullet. Grenade, crowbar, rocket, and Gravity Gun kills are okay!
Unlocked 18 Nov @ 10:50am

Conservationist

Kill five enemies with the same energy ball.
Unlocked 17 Nov @ 7:37am

Think Fast!

Kill an Elite Soldier with his own energy ball.
Unlocked 17 Nov @ 7:27am

Zombie-que

Use flares to light 15 zombies on fire.
Unlocked 17 Nov @ 8:08am

Acid Reflex

Kill an acid antlion worker.
Unlocked 18 Nov @ 11:14am

Get Some Grub

Squish every antlion grub in Episode Two.
Unlocked 18 Nov @ 12:19pm

Piñata Party

Find and break every web cache in Episode Two.
Unlocked 18 Nov @ 12:09pm

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 18 Nov @ 11:36am

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 18 Nov @ 1:47pm

Hit and Run

Run over 20 enemies with the car in Episode Two.
Unlocked 18 Nov @ 2:50pm

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 18 Nov @ 2:12pm

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.
Unlocked 18 Nov @ 2:35pm

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 18 Nov @ 2:45pm

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 19 Nov @ 1:50am

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked 19 Nov @ 1:58am

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 18 Nov @ 2:48pm

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 18 Nov @ 3:01pm

Little Rocket Man

Send the garden gnome into space.
Unlocked 19 Nov @ 2:07am

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 19 Nov @ 2:16am

Neighborhood Watch

Save all buildings outside the missile silo from destruction.
Unlocked 19 Nov @ 2:41am

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 19 Nov @ 2:41am

Payback

Kill a Hunter with its own flechettes.
Unlocked 18 Nov @ 2:11pm

Bone Breaker

Kill 30 enemies with thrown physics objects.
Unlocked 18 Nov @ 11:58am

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 18 Nov @ 11:28am

Hot Potat0wned

Kill a Combine soldier with his own grenade.
Unlocked 18 Nov @ 2:43pm

Grave Robber

Steal a Zombine's grenade.
Unlocked 18 Nov @ 11:01am

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 18 Nov @ 10:54am