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46 of 69 (67%) achievements earned:
Personal Achievements
 

Defiant

Hit the trashcan cop with the can.
Unlocked 21 Mar, 2014 @ 5:57am

Submissive

Put the can in the trash.
Unlocked 28 Oct, 2010 @ 8:25pm

Malcontent

Escape the apartment block raid.
Unlocked 18 Feb, 2012 @ 5:21pm

What cat?

Break the mini-teleporter in Kleiner's lab.
Unlocked 28 Jun, 2017 @ 10:24pm

Trusty Hardware

Get the crowbar.
Unlocked 26 Oct, 2010 @ 4:36am

Barnacle Bowling

Kill five barnacles with one barrel.
Unlocked 11 Dec, 2010 @ 6:47pm

Anchor's Aweigh!

Get the airboat.
Unlocked 12 Dec, 2010 @ 6:00am

Heavy Weapons

Get the airboat's mounted gun.
Unlocked 27 Dec, 2010 @ 5:14pm

Vorticough

Discover the hidden singing vortigaunt cave in chapter Water Hazard.
Unlocked 3 Aug, 2017 @ 2:35pm

Revenge!

Destroy the hunter-chopper in Half-Life 2.
Unlocked 28 Dec, 2010 @ 4:36pm

Blast from the Past

Find the HEV Suit Charger faceplate in Eli's scrapyard.
Unlocked 28 Dec, 2010 @ 5:21pm

Zero-Point Energy

Get the Gravity Gun in Black Mesa East.
Unlocked 28 Dec, 2010 @ 5:36pm

Two Points

Use DOG's ball to make a basket in Eli's scrapyard.
Unlocked 10 Jul, 2017 @ 5:15pm

Zombie Chopper

Play through Ravenholm using only the Gravity Gun.
Unlocked 9 Apr, 2014 @ 7:27am

Hallowed Ground

Escort Gregori safely through the church cemetery.
Unlocked 26 Nov, 2011 @ 4:41pm

OSHA Violation

Kill 3 enemies using the crane.
Unlocked 29 Oct, 2010 @ 5:29pm

Targetted Advertising

Pin a soldier to the billboard in chapter Highway 17.
Unlocked 29 Oct, 2010 @ 5:38pm

Where Cubbage Fears to Tread

Defend Little Odessa from the gunship attack.
Unlocked 12 Dec, 2010 @ 6:56am

One Man Army

Destroy six gunships in Half-Life 2.
Unlocked 2 Mar, 2012 @ 5:41pm

Keep Off the Sand!

Cross the antlion beach in chapter Sandtraps without touching the sand.
Unlocked 6 Sep, 2017 @ 5:52pm

Bug Hunt

Use the antlions to kill 50 enemies.
Unlocked 11 Dec, 2010 @ 6:08pm

Flushed

Kill an enemy with a toilet.
Unlocked 9 Sep, 2017 @ 5:36pm

Warden Freeman

Survive the second turret standoff in Nova Prospekt.
Unlocked 19 Feb, 2012 @ 8:59am

Follow Freeman

Gain command of a squad of rebels in the uprising.
Unlocked 12 Dec, 2010 @ 12:09pm

Radiation Levels Detected

Get through the toxic tunnel under City 17 in Half-Life 2.
Unlocked 12 Dec, 2010 @ 1:09pm

Plaza Defender

Survive the generator plaza standoff in chapter Anticitizen One.
Unlocked 2 Mar, 2012 @ 5:04am

Counter-Sniper

Kill all of the snipers in City 17.
Unlocked 4 Mar, 2012 @ 7:04am

Fight the Power

Shut down the supression device by disabling its generators.
Unlocked 27 Feb, 2012 @ 1:25pm

Giant Killer

Survive the rooftop strider battle in the ruins of City 17.
Unlocked 28 Feb, 2012 @ 4:56pm

Atomizer

Disintegrate 15 soldiers by throwing them into a Combine ball field.
Unlocked 29 Feb, 2012 @ 4:04pm

Singularity Collapse

Destroy the Citadel's reactor core.
Unlocked 25 Feb, 2012 @ 6:22am

Lambda Locator

Find all lambda caches in Half-Life 2.
Unlocked 16 Sep, 2017 @ 8:11pm

Hack Attack!

Kill five enemies with a Manhack.
Unlocked 7 Sep, 2017 @ 1:43pm

Watch Your Head!

Make it to the bottom of the Citadel's main elevator shaft in one piece.
Unlocked 17 Nov @ 10:39pm

Containment

Contain the Citadel core.
Unlocked 17 Nov @ 10:39pm

Pacifist

Contain the Citadel core without killing any stalkers.
Unlocked 17 Nov @ 10:39pm

Elevator Action

Survive long enough to get on the parking garage elevator.
Unlocked 17 Nov @ 10:39pm

Live Bait

Help Alyx snipe 30 enemies in Episode One.
Unlocked 17 Nov @ 10:39pm

Attica!

Destroy the gunship in the hospital attic.
Unlocked 17 Nov @ 10:39pm

Citizen Escort

Don't let any citizens die when escorting them to the escape train.
Unlocked 17 Nov @ 10:39pm

Escape From City 17

Escape City 17 with Alyx.
Unlocked 17 Nov @ 10:39pm

Conservationist

Kill five enemies with the same energy ball.
Unlocked 17 Nov @ 10:39pm

Think Fast!

Kill an Elite Soldier with his own energy ball.
Unlocked 17 Nov @ 10:39pm

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 19 Nov @ 2:39am

Grave Robber

Steal a Zombine's grenade.
Unlocked 18 Nov @ 4:30pm

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 @ 11:21am



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!

Zombie-que

Use flares to light 15 zombies on fire.

Acid Reflex

Kill an acid antlion worker.

Get Some Grub

Squish every antlion grub in Episode Two.

Piñata Party

Find and break every web cache in Episode Two.

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.

Twofer

Defeat both antlion guards outside the White Forest.

Hit and Run

Run over 20 enemies with the car in Episode Two.

Meet the Hunters

Survive the Hunter ambush with Alyx.

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.

Gunishment!

Destroy the Combine Autogun in the junkyard.

Cache Checker

Find every radar cache in chapter Under The Radar.

Pedal to the Metal

Beat DOG in a race to the White Forest base.

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.

Little Rocket Man

Send the garden gnome into space.

Secondary Silo Secured

Secure the launch doors on missile silo 2.

Neighborhood Watch

Save all buildings outside the missile silo from destruction.

Defense of the Armament

Save the missile silo from the Combine offensive.

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.