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

Defiant

Hit the trashcan cop with the can.
Unlocked 13 Apr, 2022 @ 9:29am

Submissive

Put the can in the trash.
Unlocked 13 Apr, 2022 @ 9:29am

Malcontent

Escape the apartment block raid.
Unlocked 13 Apr, 2022 @ 9:38am

What cat?

Break the mini-teleporter in Kleiner's lab.
Unlocked 28 Apr, 2022 @ 6:37pm

Trusty Hardware

Get the crowbar.
Unlocked 13 Apr, 2022 @ 10:00am

Barnacle Bowling

Kill five barnacles with one barrel.
Unlocked 13 Apr, 2022 @ 10:20am

Anchor's Aweigh!

Get the airboat.
Unlocked 13 Apr, 2022 @ 12:10pm

Heavy Weapons

Get the airboat's mounted gun.
Unlocked 13 Apr, 2022 @ 3:00pm

Vorticough

Discover the hidden singing vortigaunt cave in chapter Water Hazard.
Unlocked 28 Apr, 2022 @ 1:24pm

Revenge!

Destroy the hunter-chopper in Half-Life 2.
Unlocked 13 Apr, 2022 @ 3:19pm

Blast from the Past

Find the HEV Suit Charger faceplate in Eli's scrapyard.
Unlocked 13 Apr, 2022 @ 3:43pm

Zero-Point Energy

Get the Gravity Gun in Black Mesa East.
Unlocked 13 Apr, 2022 @ 3:43pm

Two Points

Use DOG's ball to make a basket in Eli's scrapyard.
Unlocked 13 Apr, 2022 @ 3:47pm

Zombie Chopper

Play through Ravenholm using only the Gravity Gun.
Unlocked 18 Jun, 2022 @ 7:23pm

Hallowed Ground

Escort Gregori safely through the church cemetery.
Unlocked 13 Apr, 2022 @ 4:24pm

OSHA Violation

Kill 3 enemies using the crane.
Unlocked 13 Apr, 2022 @ 5:14pm

Targetted Advertising

Pin a soldier to the billboard in chapter Highway 17.
Unlocked 28 Apr, 2022 @ 7:00pm

Where Cubbage Fears to Tread

Defend Little Odessa from the gunship attack.
Unlocked 13 Apr, 2022 @ 4:50pm

One Man Army

Destroy six gunships in Half-Life 2.
Unlocked 13 Apr, 2022 @ 6:50pm

Keep Off the Sand!

Cross the antlion beach in chapter Sandtraps without touching the sand.
Unlocked 13 Apr, 2022 @ 6:34pm

Bug Hunt

Use the antlions to kill 50 enemies.
Unlocked 13 Apr, 2022 @ 6:45pm

Flushed

Kill an enemy with a toilet.
Unlocked 18 Jun, 2022 @ 7:39pm

Warden Freeman

Survive the second turret standoff in Nova Prospekt.
Unlocked 13 Apr, 2022 @ 7:50pm

Follow Freeman

Gain command of a squad of rebels in the uprising.
Unlocked 13 Apr, 2022 @ 8:09pm

Radiation Levels Detected

Get through the toxic tunnel under City 17 in Half-Life 2.
Unlocked 13 Apr, 2022 @ 9:16pm

Plaza Defender

Survive the generator plaza standoff in chapter Anticitizen One.
Unlocked 13 Apr, 2022 @ 9:42pm

Counter-Sniper

Kill all of the snipers in City 17.
Unlocked 18 Jun, 2022 @ 7:49pm

Fight the Power

Shut down the supression device by disabling its generators.
Unlocked 13 Apr, 2022 @ 10:52pm

Giant Killer

Survive the rooftop strider battle in the ruins of City 17.
Unlocked 13 Apr, 2022 @ 11:45pm

Atomizer

Disintegrate 15 soldiers by throwing them into a Combine ball field.
Unlocked 14 Apr, 2022 @ 12:03am

Singularity Collapse

Destroy the Citadel's reactor core.
Unlocked 14 Apr, 2022 @ 12:28am

Lambda Locator

Find all lambda caches in Half-Life 2.
Unlocked 18 Jun, 2022 @ 4:49pm

Hack Attack!

Kill five enemies with a Manhack.
Unlocked 18 Jun, 2022 @ 7:34pm

Watch Your Head!

Make it to the bottom of the Citadel's main elevator shaft in one piece.
Unlocked 16 Nov @ 1:08pm

Containment

Contain the Citadel core.
Unlocked 17 Nov @ 11:06am

Pacifist

Contain the Citadel core without killing any stalkers.
Unlocked 28 Nov @ 5:15pm

Car Crusher

Use the cars to squash 15 antlions in Episode One.
Unlocked 17 Nov @ 11:38am

Elevator Action

Survive long enough to get on the parking garage elevator.
Unlocked 17 Nov @ 2:52pm

Live Bait

Help Alyx snipe 30 enemies in Episode One.
Unlocked 13 Dec @ 10:47pm

Attica!

Destroy the gunship in the hospital attic.
Unlocked 18 Nov @ 7:00am

Citizen Escort

Don't let any citizens die when escorting them to the escape train.
Unlocked 19 Nov @ 2:46pm

Escape From City 17

Escape City 17 with Alyx.
Unlocked 20 Nov @ 6:31pm

The One Free Bullet

Finish the game firing exactly one bullet. Grenade, crowbar, rocket, and Gravity Gun kills are okay!
Unlocked 20 Nov @ 6:31pm

Conservationist

Kill five enemies with the same energy ball.
Unlocked 28 Nov @ 5:04pm

Think Fast!

Kill an Elite Soldier with his own energy ball.
Unlocked 16 Nov @ 1:09pm

Zombie-que

Use flares to light 15 zombies on fire.
Unlocked 19 Nov @ 2:24pm

Acid Reflex

Kill an acid antlion worker.
Unlocked 21 Nov @ 5:34pm

Get Some Grub

Squish every antlion grub in Episode Two.
Unlocked 5 Dec @ 9:17am

Piñata Party

Find and break every web cache in Episode Two.
Unlocked 22 Nov @ 7:34pm

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 21 Nov @ 6:09pm

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 22 Nov @ 7:52pm

Hit and Run

Run over 20 enemies with the car in Episode Two.
Unlocked 26 Nov @ 8:41pm

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 23 Nov @ 6:23pm

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.
Unlocked 23 Nov @ 6:37pm

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 24 Nov @ 3:01pm

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 24 Nov @ 3:32pm

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked 26 Nov @ 8:06pm

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 24 Nov @ 3:10pm

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 24 Nov @ 3:27pm

Little Rocket Man

Send the garden gnome into space.
Unlocked 12 Dec @ 10:26am

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 26 Nov @ 8:28pm

Neighborhood Watch

Save all buildings outside the missile silo from destruction.
Unlocked 30 Nov @ 7:31pm

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 26 Nov @ 9:01pm

Payback

Kill a Hunter with its own flechettes.
Unlocked 23 Nov @ 6:21pm

Bone Breaker

Kill 30 enemies with thrown physics objects.
Unlocked 5 Dec @ 9:40am

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 21 Nov @ 6:02pm

Hot Potat0wned

Kill a Combine soldier with his own grenade.
Unlocked 12 Dec @ 10:40am

Grave Robber

Steal a Zombine's grenade.
Unlocked 22 Nov @ 7:02pm

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 20 Nov @ 6:35pm