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33 of 69 (48%) achievements earned:
Personal Achievements
 

Defiant

Hit the trashcan cop with the can.
Unlocked 13 Mar, 2011 @ 12:11pm

Submissive

Put the can in the trash.

Malcontent

Escape the apartment block raid.

What cat?

Break the mini-teleporter in Kleiner's lab.
Unlocked 14 Mar, 2011 @ 3:05am

Trusty Hardware

Get the crowbar.
Unlocked 20 Jun, 2010 @ 7:18am

Barnacle Bowling

Kill five barnacles with one barrel.
Unlocked 29 Jun, 2010 @ 4:41am

Anchor's Aweigh!

Get the airboat.
Unlocked 29 Jun, 2010 @ 5:04am

Heavy Weapons

Get the airboat's mounted gun.
Unlocked 29 Jun, 2010 @ 5:31am

Vorticough

Discover the hidden singing vortigaunt cave in chapter Water Hazard.
Unlocked 15 Mar, 2011 @ 4:42am

Revenge!

Destroy the hunter-chopper in Half-Life 2.
Unlocked 29 Jun, 2010 @ 5:42am

Blast from the Past

Find the HEV Suit Charger faceplate in Eli's scrapyard.
Unlocked 9 Aug, 2010 @ 5:11am

Zero-Point Energy

Get the Gravity Gun in Black Mesa East.
Unlocked 9 Aug, 2010 @ 5:11am

Two Points

Use DOG's ball to make a basket in Eli's scrapyard.
Unlocked 15 Mar, 2011 @ 5:00am

Zombie Chopper

Play through Ravenholm using only the Gravity Gun.
Unlocked 15 Mar, 2011 @ 5:42am

Hallowed Ground

Escort Gregori safely through the church cemetery.
Unlocked 9 Aug, 2010 @ 5:57am

OSHA Violation

Kill 3 enemies using the crane.
Unlocked 9 Aug, 2010 @ 6:26am

Targetted Advertising

Pin a soldier to the billboard in chapter Highway 17.
Unlocked 15 Mar, 2011 @ 6:08am

Where Cubbage Fears to Tread

Defend Little Odessa from the gunship attack.
Unlocked 9 Aug, 2010 @ 6:21am

One Man Army

Destroy six gunships in Half-Life 2.
Unlocked 12 Aug, 2010 @ 5:36am

Keep Off the Sand!

Cross the antlion beach in chapter Sandtraps without touching the sand.
Unlocked 30 Aug, 2013 @ 8:56am

Bug Hunt

Use the antlions to kill 50 enemies.
Unlocked 9 Aug, 2010 @ 7:40am

Flushed

Kill an enemy with a toilet.
Unlocked 25 May, 2011 @ 8:41am

Warden Freeman

Survive the second turret standoff in Nova Prospekt.
Unlocked 10 Aug, 2010 @ 5:37am

Follow Freeman

Gain command of a squad of rebels in the uprising.
Unlocked 10 Aug, 2010 @ 6:06am

Radiation Levels Detected

Get through the toxic tunnel under City 17 in Half-Life 2.
Unlocked 10 Aug, 2010 @ 6:28am

Plaza Defender

Survive the generator plaza standoff in chapter Anticitizen One.
Unlocked 10 Aug, 2010 @ 6:46am

Counter-Sniper

Kill all of the snipers in City 17.
Unlocked 1 May, 2011 @ 4:16am

Fight the Power

Shut down the supression device by disabling its generators.
Unlocked 12 Aug, 2010 @ 5:32am

Giant Killer

Survive the rooftop strider battle in the ruins of City 17.
Unlocked 12 Aug, 2010 @ 6:04am

Atomizer

Disintegrate 15 soldiers by throwing them into a Combine ball field.
Unlocked 17 Mar, 2011 @ 6:23am

Singularity Collapse

Destroy the Citadel's reactor core.
Unlocked 12 Aug, 2010 @ 6:40am

Lambda Locator

Find all lambda caches in Half-Life 2.
Unlocked 31 Aug, 2013 @ 1:08pm

Hack Attack!

Kill five enemies with a Manhack.
Unlocked 12 Aug, 2010 @ 6:21am



Watch Your Head!

Make it to the bottom of the Citadel's main elevator shaft in one piece.

Containment

Contain the Citadel core.

Pacifist

Contain the Citadel core without killing any stalkers.

Car Crusher

Use the cars to squash 15 antlions in Episode One.

Elevator Action

Survive long enough to get on the parking garage elevator.

Live Bait

Help Alyx snipe 30 enemies in Episode One.

Attica!

Destroy the gunship in the hospital attic.

Citizen Escort

Don't let any citizens die when escorting them to the escape train.

Escape From City 17

Escape City 17 with Alyx.

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.

Think Fast!

Kill an Elite Soldier with his own energy ball.

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.

Deadly Harvest

Kill an enemy by planting a hopper mine.

Hot Potat0wned

Kill a Combine soldier with his own grenade.

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.