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

Defiant

Hit the trashcan cop with the can.
Unlocked 3 Jan, 2016 @ 9:17pm

Submissive

Put the can in the trash.
Unlocked 19 Jun, 2016 @ 12:34pm

Malcontent

Escape the apartment block raid.
Unlocked 3 Jan, 2016 @ 9:24pm

What cat?

Break the mini-teleporter in Kleiner's lab.
Unlocked 3 Dec, 2024 @ 5:10pm

Trusty Hardware

Get the crowbar.
Unlocked 3 Jan, 2016 @ 9:36pm

Barnacle Bowling

Kill five barnacles with one barrel.
Unlocked 19 Jun, 2016 @ 1:12pm

Anchor's Aweigh!

Get the airboat.
Unlocked 3 Jan, 2016 @ 10:17pm

Heavy Weapons

Get the airboat's mounted gun.
Unlocked 3 Jan, 2016 @ 11:00pm

Vorticough

Discover the hidden singing vortigaunt cave in chapter Water Hazard.
Unlocked 3 Dec, 2024 @ 6:35pm

Revenge!

Destroy the hunter-chopper in Half-Life 2.
Unlocked 3 Jan, 2016 @ 11:20pm

Blast from the Past

Find the HEV Suit Charger faceplate in Eli's scrapyard.
Unlocked 22 Jun, 2016 @ 7:24pm

Zero-Point Energy

Get the Gravity Gun in Black Mesa East.
Unlocked 4 Jan, 2016 @ 1:16pm

Two Points

Use DOG's ball to make a basket in Eli's scrapyard.
Unlocked 3 Dec, 2024 @ 6:55pm

Zombie Chopper

Play through Ravenholm using only the Gravity Gun.
Unlocked 3 Dec, 2024 @ 7:56pm

Hallowed Ground

Escort Gregori safely through the church cemetery.
Unlocked 4 Jan, 2016 @ 2:18pm

OSHA Violation

Kill 3 enemies using the crane.
Unlocked 4 Jan, 2016 @ 2:55pm

Targetted Advertising

Pin a soldier to the billboard in chapter Highway 17.
Unlocked 3 Dec, 2024 @ 8:20pm

Where Cubbage Fears to Tread

Defend Little Odessa from the gunship attack.
Unlocked 4 Jan, 2016 @ 2:47pm

One Man Army

Destroy six gunships in Half-Life 2.
Unlocked 6 Jan, 2016 @ 12:21pm

Keep Off the Sand!

Cross the antlion beach in chapter Sandtraps without touching the sand.
Unlocked 10 Dec, 2024 @ 5:12pm

Bug Hunt

Use the antlions to kill 50 enemies.
Unlocked 4 Jan, 2016 @ 7:21pm

Flushed

Kill an enemy with a toilet.
Unlocked 4 Dec, 2024 @ 9:23pm

Warden Freeman

Survive the second turret standoff in Nova Prospekt.
Unlocked 5 Jan, 2016 @ 6:13pm

Follow Freeman

Gain command of a squad of rebels in the uprising.
Unlocked 5 Jan, 2016 @ 6:32pm

Radiation Levels Detected

Get through the toxic tunnel under City 17 in Half-Life 2.
Unlocked 5 Jan, 2016 @ 7:04pm

Plaza Defender

Survive the generator plaza standoff in chapter Anticitizen One.
Unlocked 5 Jan, 2016 @ 7:21pm

Counter-Sniper

Kill all of the snipers in City 17.
Unlocked 5 Jan, 2016 @ 7:40pm

Fight the Power

Shut down the supression device by disabling its generators.
Unlocked 5 Jan, 2016 @ 8:02pm

Giant Killer

Survive the rooftop strider battle in the ruins of City 17.
Unlocked 6 Jan, 2016 @ 12:59pm

Atomizer

Disintegrate 15 soldiers by throwing them into a Combine ball field.
Unlocked 8 Dec, 2024 @ 5:42pm

Singularity Collapse

Destroy the Citadel's reactor core.
Unlocked 6 Jan, 2016 @ 5:49pm

Lambda Locator

Find all lambda caches in Half-Life 2.
Unlocked 11 Dec, 2024 @ 5:28pm

Hack Attack!

Kill five enemies with a Manhack.
Unlocked 4 Dec, 2024 @ 10:58pm

Watch Your Head!

Make it to the bottom of the Citadel's main elevator shaft in one piece.
Unlocked 8 Dec, 2024 @ 6:49pm

Containment

Contain the Citadel core.
Unlocked 8 Dec, 2024 @ 7:02pm

Pacifist

Contain the Citadel core without killing any stalkers.
Unlocked 8 Dec, 2024 @ 7:02pm

Car Crusher

Use the cars to squash 15 antlions in Episode One.
Unlocked 8 Dec, 2024 @ 7:22pm

Elevator Action

Survive long enough to get on the parking garage elevator.
Unlocked 8 Dec, 2024 @ 7:37pm

Live Bait

Help Alyx snipe 30 enemies in Episode One.
Unlocked 8 Dec, 2024 @ 7:54pm

Attica!

Destroy the gunship in the hospital attic.
Unlocked 8 Dec, 2024 @ 8:15pm

Citizen Escort

Don't let any citizens die when escorting them to the escape train.
Unlocked 8 Dec, 2024 @ 8:37pm

Escape From City 17

Escape City 17 with Alyx.
Unlocked 8 Dec, 2024 @ 8:43pm

The One Free Bullet

Finish the game firing exactly one bullet. Grenade, crowbar, rocket, and Gravity Gun kills are okay!
Unlocked 8 Dec, 2024 @ 8:43pm

Conservationist

Kill five enemies with the same energy ball.
Unlocked 8 Dec, 2024 @ 6:57pm

Think Fast!

Kill an Elite Soldier with his own energy ball.
Unlocked 8 Dec, 2024 @ 6:49pm

Zombie-que

Use flares to light 15 zombies on fire.
Unlocked 8 Dec, 2024 @ 8:23pm

Acid Reflex

Kill an acid antlion worker.
Unlocked 11 Dec, 2024 @ 5:53pm

Get Some Grub

Squish every antlion grub in Episode Two.
Unlocked 11 Dec, 2024 @ 7:20pm

Piñata Party

Find and break every web cache in Episode Two.
Unlocked 11 Dec, 2024 @ 7:07pm

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 11 Dec, 2024 @ 6:19pm

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 11 Dec, 2024 @ 7:26pm

Hit and Run

Run over 20 enemies with the car in Episode Two.
Unlocked 11 Dec, 2024 @ 8:48pm

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 11 Dec, 2024 @ 8:01pm

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.
Unlocked 11 Dec, 2024 @ 8:35pm

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 11 Dec, 2024 @ 8:44pm

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 11 Dec, 2024 @ 9:08pm

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked 11 Dec, 2024 @ 9:14pm

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 11 Dec, 2024 @ 8:49pm

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 11 Dec, 2024 @ 9:04pm

Little Rocket Man

Send the garden gnome into space.
Unlocked 11 Dec, 2024 @ 9:21pm

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 11 Dec, 2024 @ 9:33pm

Neighborhood Watch

Save all buildings outside the missile silo from destruction.
Unlocked 11 Dec, 2024 @ 10:19pm

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 11 Dec, 2024 @ 10:19pm

Payback

Kill a Hunter with its own flechettes.
Unlocked 11 Dec, 2024 @ 8:00pm

Bone Breaker

Kill 30 enemies with thrown physics objects.
Unlocked 11 Dec, 2024 @ 7:34pm

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 11 Dec, 2024 @ 6:10pm

Hot Potat0wned

Kill a Combine soldier with his own grenade.
Unlocked 11 Dec, 2024 @ 8:14pm

Grave Robber

Steal a Zombine's grenade.
Unlocked 11 Dec, 2024 @ 5:36pm

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 8 Dec, 2024 @ 8:45pm