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33 of 33 (100%) achievements earned:

Personal Achievements
 
Unlocked Aug 19, 2010 @ 10:53pm

Defiant

Hit the trashcan cop with the can.
Unlocked Aug 19, 2010 @ 10:53pm

Submissive

Put the can in the trash.
Unlocked Aug 19, 2010 @ 10:57pm

Malcontent

Escape the apartment block raid.
Unlocked Aug 21, 2011 @ 12:19pm

What cat?

Break the mini-teleporter in Kleiner's lab.
Unlocked Aug 19, 2010 @ 11:09pm

Trusty Hardware

Get the crowbar.
Unlocked Aug 19, 2010 @ 11:16pm

Barnacle Bowling

Kill five barnacles with one barrel.
Unlocked Aug 20, 2010 @ 9:51am

Anchor's Aweigh!

Get the airboat.
Unlocked Aug 29, 2010 @ 9:39pm

Heavy Weapons

Get the airboat's mounted gun.
Unlocked Aug 29, 2010 @ 9:47pm

Vorticough

Discover the hidden singing vortigaunt cave in chapter Water Hazard.
Unlocked Aug 29, 2010 @ 9:45pm

Revenge!

Destroy the hunter-chopper in Half-Life 2.
Unlocked Sep 13, 2010 @ 12:54pm

Blast from the Past

Find the HEV Suit Charger faceplate in Eli's scrapyard.
Unlocked Sep 13, 2010 @ 12:54pm

Zero-Point Energy

Get the Gravity Gun in Black Mesa East.
Unlocked Nov 12, 2013 @ 3:18pm

Two Points

Use DOG's ball to make a basket in Eli's scrapyard.
Unlocked Sep 13, 2010 @ 1:29pm

Zombie Chopper

Play through Ravenholm using only the Gravity Gun.
Unlocked Sep 13, 2010 @ 1:26pm

Hallowed Ground

Escort Gregori safely through the church cemetery.
Unlocked Sep 13, 2010 @ 5:30pm

OSHA Violation

Kill 3 enemies using the crane.
Unlocked Sep 13, 2010 @ 5:35pm

Targetted Advertising

Pin a soldier to the billboard in chapter Highway 17.
Unlocked Sep 13, 2010 @ 5:27pm

Where Cubbage Fears to Tread

Defend Little Odessa from the gunship attack.
Unlocked Sep 16, 2010 @ 10:37am

One Man Army

Destroy six gunships in Half-Life 2.
Unlocked Nov 12, 2013 @ 3:09pm

Keep Off the Sand!

Cross the antlion beach in chapter Sandtraps without touching the sand.
Unlocked Sep 22, 2010 @ 3:04pm

Bug Hunt

Use the antlions to kill 50 enemies.
Unlocked Sep 16, 2010 @ 10:39am

Flushed

Kill an enemy with a toilet.
Unlocked Dec 4, 2010 @ 2:51pm

Warden Freeman

Survive the second turret standoff in Nova Prospekt.
Unlocked Dec 4, 2010 @ 3:07pm

Follow Freeman

Gain command of a squad of rebels in the uprising.
Unlocked Dec 11, 2010 @ 9:43pm

Radiation Levels Detected

Get through the toxic tunnel under City 17 in Half-Life 2.
Unlocked Apr 11, 2012 @ 9:46pm

Plaza Defender

Survive the generator plaza standoff in chapter Anticitizen One.
Unlocked Apr 17, 2014 @ 4:04pm

Counter-Sniper

Kill all of the snipers in City 17.
Unlocked Dec 11, 2010 @ 10:20pm

Fight the Power

Shut down the supression device by disabling its generators.
Unlocked Dec 16, 2010 @ 2:46pm

Giant Killer

Survive the rooftop strider battle in the ruins of City 17.
Unlocked Jan 12, 2014 @ 4:53pm

Atomizer

Disintegrate 15 soldiers by throwing them into a Combine ball field.
Unlocked Dec 16, 2010 @ 3:15pm

Singularity Collapse

Destroy the Citadel's reactor core.
Unlocked Apr 17, 2014 @ 3:56pm

Lambda Locator

Find all lambda caches in Half-Life 2.
Unlocked Apr 11, 2012 @ 9:25pm

Hack Attack!

Kill five enemies with a Manhack.