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

Defiant

Hit the trashcan cop with the can.
Unlocked 7 Jul, 2015 @ 12:27pm

Submissive

Put the can in the trash.
Unlocked 9 Aug, 2015 @ 4:41am

Malcontent

Escape the apartment block raid.
Unlocked 7 Jul, 2015 @ 12:43pm

What cat?

Break the mini-teleporter in Kleiner's lab.
Unlocked 8 Aug, 2015 @ 2:21pm

Trusty Hardware

Get the crowbar.
Unlocked 7 Jul, 2015 @ 12:58pm

Barnacle Bowling

Kill five barnacles with one barrel.
Unlocked 7 Jul, 2015 @ 3:51pm

Anchor's Aweigh!

Get the airboat.
Unlocked 7 Jul, 2015 @ 4:43pm

Heavy Weapons

Get the airboat's mounted gun.
Unlocked 8 Jul, 2015 @ 12:54pm

Vorticough

Discover the hidden singing vortigaunt cave in chapter Water Hazard.
Unlocked 9 Aug, 2015 @ 3:22am

Revenge!

Destroy the hunter-chopper in Half-Life 2.
Unlocked 8 Jul, 2015 @ 1:08pm

Blast from the Past

Find the HEV Suit Charger faceplate in Eli's scrapyard.
Unlocked 8 Aug, 2015 @ 2:34pm

Zero-Point Energy

Get the Gravity Gun in Black Mesa East.
Unlocked 9 Jul, 2015 @ 12:25pm

Two Points

Use DOG's ball to make a basket in Eli's scrapyard.
Unlocked 8 Aug, 2015 @ 2:38pm

Zombie Chopper

Play through Ravenholm using only the Gravity Gun.
Unlocked 8 Aug, 2015 @ 3:34pm

Hallowed Ground

Escort Gregori safely through the church cemetery.
Unlocked 9 Jul, 2015 @ 2:00pm

OSHA Violation

Kill 3 enemies using the crane.
Unlocked 10 Jul, 2015 @ 1:11pm

Targetted Advertising

Pin a soldier to the billboard in chapter Highway 17.
Unlocked 9 Aug, 2015 @ 3:49am

Where Cubbage Fears to Tread

Defend Little Odessa from the gunship attack.
Unlocked 10 Jul, 2015 @ 1:00pm

One Man Army

Destroy six gunships in Half-Life 2.
Unlocked 11 Jul, 2015 @ 1:20pm

Keep Off the Sand!

Cross the antlion beach in chapter Sandtraps without touching the sand.
Unlocked 9 Aug, 2015 @ 4:20am

Bug Hunt

Use the antlions to kill 50 enemies.
Unlocked 11 Jul, 2015 @ 1:15pm

Flushed

Kill an enemy with a toilet.
Unlocked 9 Aug, 2015 @ 4:21am

Warden Freeman

Survive the second turret standoff in Nova Prospekt.
Unlocked 12 Jul, 2015 @ 12:38pm

Follow Freeman

Gain command of a squad of rebels in the uprising.
Unlocked 13 Jul, 2015 @ 11:54am

Radiation Levels Detected

Get through the toxic tunnel under City 17 in Half-Life 2.
Unlocked 13 Jul, 2015 @ 12:37pm

Plaza Defender

Survive the generator plaza standoff in chapter Anticitizen One.
Unlocked 13 Jul, 2015 @ 1:01pm

Counter-Sniper

Kill all of the snipers in City 17.
Unlocked 9 Aug, 2015 @ 4:33am

Fight the Power

Shut down the supression device by disabling its generators.
Unlocked 14 Jul, 2015 @ 12:19pm

Giant Killer

Survive the rooftop strider battle in the ruins of City 17.
Unlocked 14 Jul, 2015 @ 1:02pm

Atomizer

Disintegrate 15 soldiers by throwing them into a Combine ball field.
Unlocked 15 Jul, 2015 @ 12:02pm

Singularity Collapse

Destroy the Citadel's reactor core.
Unlocked 15 Jul, 2015 @ 12:27pm

Lambda Locator

Find all lambda caches in Half-Life 2.
Unlocked 9 Aug, 2015 @ 2:30pm

Hack Attack!

Kill five enemies with a Manhack.
Unlocked 9 Aug, 2015 @ 7:05am

Watch Your Head!

Make it to the bottom of the Citadel's main elevator shaft in one piece.
Unlocked 29 Nov, 2024 @ 4:22pm

Containment

Contain the Citadel core.
Unlocked 29 Nov, 2024 @ 4:22pm

Pacifist

Contain the Citadel core without killing any stalkers.
Unlocked 29 Nov, 2024 @ 4:22pm

Car Crusher

Use the cars to squash 15 antlions in Episode One.
Unlocked 29 Nov, 2024 @ 4:22pm

Elevator Action

Survive long enough to get on the parking garage elevator.
Unlocked 29 Nov, 2024 @ 4:22pm

Live Bait

Help Alyx snipe 30 enemies in Episode One.
Unlocked 29 Nov, 2024 @ 4:22pm

Attica!

Destroy the gunship in the hospital attic.
Unlocked 29 Nov, 2024 @ 4:22pm

Citizen Escort

Don't let any citizens die when escorting them to the escape train.
Unlocked 29 Nov, 2024 @ 4:22pm

Escape From City 17

Escape City 17 with Alyx.
Unlocked 29 Nov, 2024 @ 4:22pm

The One Free Bullet

Finish the game firing exactly one bullet. Grenade, crowbar, rocket, and Gravity Gun kills are okay!
Unlocked 29 Nov, 2024 @ 4:22pm

Conservationist

Kill five enemies with the same energy ball.
Unlocked 29 Nov, 2024 @ 4:22pm

Think Fast!

Kill an Elite Soldier with his own energy ball.
Unlocked 29 Nov, 2024 @ 4:22pm

Zombie-que

Use flares to light 15 zombies on fire.
Unlocked 29 Nov, 2024 @ 4:22pm

Acid Reflex

Kill an acid antlion worker.
Unlocked 29 Nov, 2024 @ 4:22pm

Get Some Grub

Squish every antlion grub in Episode Two.
Unlocked 29 Nov, 2024 @ 4:22pm

Piñata Party

Find and break every web cache in Episode Two.
Unlocked 29 Nov, 2024 @ 4:22pm

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 29 Nov, 2024 @ 4:22pm

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 29 Nov, 2024 @ 4:22pm

Hit and Run

Run over 20 enemies with the car in Episode Two.
Unlocked 29 Nov, 2024 @ 4:22pm

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 29 Nov, 2024 @ 4:22pm

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.
Unlocked 29 Nov, 2024 @ 4:22pm

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 29 Nov, 2024 @ 4:22pm

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 29 Nov, 2024 @ 4:22pm

Pedal to the Metal

Beat DOG in a race to the White Forest base.
Unlocked 29 Nov, 2024 @ 4:22pm

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 29 Nov, 2024 @ 4:22pm

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 29 Nov, 2024 @ 4:22pm

Little Rocket Man

Send the garden gnome into space.
Unlocked 29 Nov, 2024 @ 4:22pm

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 29 Nov, 2024 @ 4:22pm

Neighborhood Watch

Save all buildings outside the missile silo from destruction.
Unlocked 29 Nov, 2024 @ 4:22pm

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 29 Nov, 2024 @ 4:22pm

Payback

Kill a Hunter with its own flechettes.
Unlocked 29 Nov, 2024 @ 4:22pm

Bone Breaker

Kill 30 enemies with thrown physics objects.
Unlocked 29 Nov, 2024 @ 4:22pm

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 29 Nov, 2024 @ 4:22pm

Hot Potat0wned

Kill a Combine soldier with his own grenade.
Unlocked 29 Nov, 2024 @ 4:22pm

Grave Robber

Steal a Zombine's grenade.
Unlocked 29 Nov, 2024 @ 4:22pm

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 29 Nov, 2024 @ 4:22pm