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53 of 69 (77%) achievements earned:
Personal Achievements
 

Defiant

Hit the trashcan cop with the can.
Unlocked 20 Dec, 2016 @ 5:38pm

Submissive

Put the can in the trash.
Unlocked 25 Nov, 2019 @ 5:54am

Malcontent

Escape the apartment block raid.
Unlocked 29 Jan, 2014 @ 11:52pm

What cat?

Break the mini-teleporter in Kleiner's lab.
Unlocked 24 Nov, 2019 @ 8:07pm

Trusty Hardware

Get the crowbar.
Unlocked 30 Jan, 2014 @ 9:21am

Barnacle Bowling

Kill five barnacles with one barrel.
Unlocked 20 Dec, 2016 @ 6:37pm

Anchor's Aweigh!

Get the airboat.
Unlocked 30 Jan, 2014 @ 1:32pm

Heavy Weapons

Get the airboat's mounted gun.
Unlocked 29 Dec, 2016 @ 12:29pm

Vorticough

Discover the hidden singing vortigaunt cave in chapter Water Hazard.
Unlocked 7 Dec, 2019 @ 12:19pm

Revenge!

Destroy the hunter-chopper in Half-Life 2.
Unlocked 4 Jan, 2017 @ 11:56am

Blast from the Past

Find the HEV Suit Charger faceplate in Eli's scrapyard.
Unlocked 25 Nov, 2019 @ 5:47am

Zero-Point Energy

Get the Gravity Gun in Black Mesa East.
Unlocked 4 Jan, 2017 @ 12:21pm

Two Points

Use DOG's ball to make a basket in Eli's scrapyard.
Unlocked 24 Nov, 2019 @ 8:02pm

Zombie Chopper

Play through Ravenholm using only the Gravity Gun.
Unlocked 14 Aug, 2021 @ 4:48pm

Hallowed Ground

Escort Gregori safely through the church cemetery.
Unlocked 4 Jan, 2017 @ 1:40pm

OSHA Violation

Kill 3 enemies using the crane.
Unlocked 14 Aug, 2021 @ 7:28am

Targetted Advertising

Pin a soldier to the billboard in chapter Highway 17.
Unlocked 15 Aug, 2021 @ 8:07am

Where Cubbage Fears to Tread

Defend Little Odessa from the gunship attack.
Unlocked 13 Mar, 2017 @ 5:27pm

One Man Army

Destroy six gunships in Half-Life 2.
Unlocked 21 May, 2017 @ 4:29pm

Keep Off the Sand!

Cross the antlion beach in chapter Sandtraps without touching the sand.
Unlocked 15 Aug, 2021 @ 8:41am

Bug Hunt

Use the antlions to kill 50 enemies.
Unlocked 25 Mar, 2017 @ 5:54pm

Flushed

Kill an enemy with a toilet.
Unlocked 15 Aug, 2021 @ 5:11am

Warden Freeman

Survive the second turret standoff in Nova Prospekt.
Unlocked 14 May, 2017 @ 2:30pm

Follow Freeman

Gain command of a squad of rebels in the uprising.
Unlocked 14 May, 2017 @ 3:14pm

Radiation Levels Detected

Get through the toxic tunnel under City 17 in Half-Life 2.
Unlocked 14 May, 2017 @ 3:36pm

Plaza Defender

Survive the generator plaza standoff in chapter Anticitizen One.
Unlocked 14 May, 2017 @ 3:53pm

Counter-Sniper

Kill all of the snipers in City 17.
Unlocked 15 Aug, 2021 @ 8:17am

Fight the Power

Shut down the supression device by disabling its generators.
Unlocked 20 May, 2017 @ 8:26pm

Giant Killer

Survive the rooftop strider battle in the ruins of City 17.
Unlocked 21 May, 2017 @ 5:10pm

Atomizer

Disintegrate 15 soldiers by throwing them into a Combine ball field.
Unlocked 15 Aug, 2021 @ 5:42am

Singularity Collapse

Destroy the Citadel's reactor core.
Unlocked 21 May, 2017 @ 5:57pm

Lambda Locator

Find all lambda caches in Half-Life 2.
Unlocked 15 Aug, 2021 @ 5:05am

Hack Attack!

Kill five enemies with a Manhack.
Unlocked 15 Aug, 2021 @ 5:18am

Watch Your Head!

Make it to the bottom of the Citadel's main elevator shaft in one piece.
Unlocked 16 Nov @ 9:20am

Containment

Contain the Citadel core.
Unlocked 16 Nov @ 9:20am

Elevator Action

Survive long enough to get on the parking garage elevator.
Unlocked 16 Nov @ 9:20am

Live Bait

Help Alyx snipe 30 enemies in Episode One.
Unlocked 16 Nov @ 9:20am

Attica!

Destroy the gunship in the hospital attic.
Unlocked 16 Nov @ 9:20am

Citizen Escort

Don't let any citizens die when escorting them to the escape train.
Unlocked 16 Nov @ 9:20am

Escape From City 17

Escape City 17 with Alyx.
Unlocked 16 Nov @ 9:20am

Think Fast!

Kill an Elite Soldier with his own energy ball.
Unlocked 16 Nov @ 9:20am

Acid Reflex

Kill an acid antlion worker.
Unlocked 16 Nov @ 9:20am

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 16 Nov @ 9:20am

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 16 Nov @ 9:20am

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 16 Nov @ 9:20am

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 16 Nov @ 9:20am

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 16 Nov @ 9:20am

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 16 Nov @ 9:20am

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 16 Nov @ 9:20am

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 16 Nov @ 9:20am

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 16 Nov @ 9:20am

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 16 Nov @ 9:20am

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 16 Nov @ 9:20am



Pacifist

Contain the Citadel core without killing any stalkers.

Car Crusher

Use the cars to squash 15 antlions in Episode One.

The One Free Bullet

Finish the game firing exactly one bullet. Grenade, crowbar, rocket, and Gravity Gun kills are okay!

Conservationist

Kill five enemies with the same energy ball.

Zombie-que

Use flares to light 15 zombies on fire.

Get Some Grub

Squish every antlion grub in Episode Two.

Piñata Party

Find and break every web cache in Episode Two.

Hit and Run

Run over 20 enemies with the car in Episode Two.

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.

Pedal to the Metal

Beat DOG in a race to the White Forest base.

Little Rocket Man

Send the garden gnome into space.

Neighborhood Watch

Save all buildings outside the missile silo from destruction.

Payback

Kill a Hunter with its own flechettes.

Bone Breaker

Kill 30 enemies with thrown physics objects.

Hot Potat0wned

Kill a Combine soldier with his own grenade.

Grave Robber

Steal a Zombine's grenade.