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51 of 69 (74%) achievements earned:
Personal Achievements
 

Defiant

Hit the trashcan cop with the can.
Unlocked 21 Aug, 2010 @ 4:47am

Submissive

Put the can in the trash.
Unlocked 27 Jun, 2010 @ 1:08am

Malcontent

Escape the apartment block raid.
Unlocked 16 Jun, 2010 @ 4:36pm

What cat?

Break the mini-teleporter in Kleiner's lab.
Unlocked 16 Apr, 2014 @ 2:23pm

Trusty Hardware

Get the crowbar.
Unlocked 16 Apr, 2014 @ 2:29pm

Barnacle Bowling

Kill five barnacles with one barrel.
Unlocked 16 Apr, 2014 @ 2:38pm

Anchor's Aweigh!

Get the airboat.
Unlocked 11 Nov, 2015 @ 8:30am

Heavy Weapons

Get the airboat's mounted gun.
Unlocked 19 May, 2016 @ 9:54am

Vorticough

Discover the hidden singing vortigaunt cave in chapter Water Hazard.
Unlocked 25 Jan, 2020 @ 11:44am

Revenge!

Destroy the hunter-chopper in Half-Life 2.
Unlocked 19 May, 2016 @ 10:02am

Blast from the Past

Find the HEV Suit Charger faceplate in Eli's scrapyard.
Unlocked 19 May, 2016 @ 10:17am

Zero-Point Energy

Get the Gravity Gun in Black Mesa East.
Unlocked 19 May, 2016 @ 10:16am

Hallowed Ground

Escort Gregori safely through the church cemetery.
Unlocked 25 Jan, 2020 @ 1:53pm

OSHA Violation

Kill 3 enemies using the crane.
Unlocked 25 Jan, 2020 @ 2:19pm

Targetted Advertising

Pin a soldier to the billboard in chapter Highway 17.
Unlocked 25 Jan, 2020 @ 2:28pm

Where Cubbage Fears to Tread

Defend Little Odessa from the gunship attack.
Unlocked 25 Jan, 2020 @ 2:14pm

One Man Army

Destroy six gunships in Half-Life 2.
Unlocked 29 Jan, 2020 @ 1:05pm

Bug Hunt

Use the antlions to kill 50 enemies.
Unlocked 25 Jan, 2020 @ 3:21pm

Warden Freeman

Survive the second turret standoff in Nova Prospekt.
Unlocked 19 Jun, 2016 @ 11:04am

Follow Freeman

Gain command of a squad of rebels in the uprising.
Unlocked 25 Jan, 2020 @ 4:27pm

Radiation Levels Detected

Get through the toxic tunnel under City 17 in Half-Life 2.
Unlocked 25 Jan, 2020 @ 4:44pm

Plaza Defender

Survive the generator plaza standoff in chapter Anticitizen One.
Unlocked 25 Jan, 2020 @ 5:00pm

Counter-Sniper

Kill all of the snipers in City 17.
Unlocked 25 Jan, 2020 @ 5:18pm

Fight the Power

Shut down the supression device by disabling its generators.
Unlocked 29 Jan, 2020 @ 1:01pm

Giant Killer

Survive the rooftop strider battle in the ruins of City 17.
Unlocked 29 Jan, 2020 @ 1:32pm

Atomizer

Disintegrate 15 soldiers by throwing them into a Combine ball field.
Unlocked 21 Nov @ 12:43pm

Singularity Collapse

Destroy the Citadel's reactor core.
Unlocked 21 Nov @ 12:59pm

Watch Your Head!

Make it to the bottom of the Citadel's main elevator shaft in one piece.
Unlocked 16 Nov @ 2:28pm

Containment

Contain the Citadel core.
Unlocked 16 Nov @ 2:28pm

Elevator Action

Survive long enough to get on the parking garage elevator.
Unlocked 16 Nov @ 2:28pm

Live Bait

Help Alyx snipe 30 enemies in Episode One.
Unlocked 16 Nov @ 2:28pm

Attica!

Destroy the gunship in the hospital attic.
Unlocked 16 Nov @ 2:28pm

Citizen Escort

Don't let any citizens die when escorting them to the escape train.
Unlocked 16 Nov @ 2:28pm

Escape From City 17

Escape City 17 with Alyx.
Unlocked 16 Nov @ 2:28pm

Think Fast!

Kill an Elite Soldier with his own energy ball.
Unlocked 16 Nov @ 2:28pm

Acid Reflex

Kill an acid antlion worker.
Unlocked 16 Nov @ 2:28pm

Into the Breach

Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft.
Unlocked 16 Nov @ 2:28pm

Twofer

Defeat both antlion guards outside the White Forest.
Unlocked 16 Nov @ 2:28pm

Hit and Run

Run over 20 enemies with the car in Episode Two.
Unlocked 16 Nov @ 2:28pm

Meet the Hunters

Survive the Hunter ambush with Alyx.
Unlocked 16 Nov @ 2:28pm

Puttin' On a Clinic

Defeat the chopper in Episode Two without any misses.
Unlocked 16 Nov @ 2:28pm

Gunishment!

Destroy the Combine Autogun in the junkyard.
Unlocked 16 Nov @ 2:28pm

Cache Checker

Find every radar cache in chapter Under The Radar.
Unlocked 16 Nov @ 2:28pm

Gordon Propelled Rocket

Unlock the rocket launcher lambda cache in chapter Under The Radar.
Unlocked 16 Nov @ 2:28pm

Quiet Mountain Getaway

Survive the ambush at White Forest Inn.
Unlocked 16 Nov @ 2:28pm

Little Rocket Man

Send the garden gnome into space.
Unlocked 16 Nov @ 2:28pm

Secondary Silo Secured

Secure the launch doors on missile silo 2.
Unlocked 16 Nov @ 2:28pm

Defense of the Armament

Save the missile silo from the Combine offensive.
Unlocked 16 Nov @ 2:28pm

Bone Breaker

Kill 30 enemies with thrown physics objects.
Unlocked 16 Nov @ 2:28pm

Deadly Harvest

Kill an enemy by planting a hopper mine.
Unlocked 16 Nov @ 2:28pm

Hot Potat0wned

Kill a Combine soldier with his own grenade.
Unlocked 16 Nov @ 2:28pm



Two Points

Use DOG's ball to make a basket in Eli's scrapyard.

Zombie Chopper

Play through Ravenholm using only the Gravity Gun.

Keep Off the Sand!

Cross the antlion beach in chapter Sandtraps without touching the sand.

Flushed

Kill an enemy with a toilet.

Lambda Locator

Find all lambda caches in Half-Life 2.

Hack Attack!

Kill five enemies with a Manhack.

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.

Pedal to the Metal

Beat DOG in a race to the White Forest base.

Neighborhood Watch

Save all buildings outside the missile silo from destruction.

Payback

Kill a Hunter with its own flechettes.

Grave Robber

Steal a Zombine's grenade.

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.