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29 of 33 (88%) achievements earned:

Personal Achievements
 

Defiant

Hit the trashcan cop with the can.

Malcontent

Escape the apartment block raid.

What cat?

Break the mini-teleporter in Kleiner's lab.
Unlocked May 31, 2010 @ 1:03am

Trusty Hardware

Get the crowbar.
Unlocked Feb 26, 2011 @ 7:42am

Barnacle Bowling

Kill five barnacles with one barrel.
Unlocked Jun 6, 2010 @ 9:22am

Anchor's Aweigh!

Get the airboat.
Unlocked Feb 24, 2011 @ 11:31am

Heavy Weapons

Get the airboat's mounted gun.
Unlocked Feb 26, 2011 @ 9:41am

Vorticough

Discover the hidden singing vortigaunt cave in chapter Water Hazard.
Unlocked Feb 24, 2011 @ 11:41am

Revenge!

Destroy the hunter-chopper in Half-Life 2.

Blast from the Past

Find the HEV Suit Charger faceplate in Eli's scrapyard.
Unlocked Jun 3, 2010 @ 12:22am

Zero-Point Energy

Get the Gravity Gun in Black Mesa East.
Unlocked Feb 26, 2011 @ 9:59am

Two Points

Use DOG's ball to make a basket in Eli's scrapyard.
Unlocked Feb 24, 2011 @ 12:41pm

Hallowed Ground

Escort Gregori safely through the church cemetery.
Unlocked Feb 27, 2011 @ 12:03pm

OSHA Violation

Kill 3 enemies using the crane.
Unlocked Feb 27, 2011 @ 12:10pm

Targetted Advertising

Pin a soldier to the billboard in chapter Highway 17.
Unlocked Feb 24, 2011 @ 12:59pm

Where Cubbage Fears to Tread

Defend Little Odessa from the gunship attack.
Unlocked Feb 25, 2011 @ 10:17am

One Man Army

Destroy six gunships in Half-Life 2.
Unlocked Feb 25, 2011 @ 10:15am

Bug Hunt

Use the antlions to kill 50 enemies.
Unlocked Apr 10, 2011 @ 7:26am

Flushed

Kill an enemy with a toilet.
Unlocked Feb 25, 2011 @ 11:10am

Warden Freeman

Survive the second turret standoff in Nova Prospekt.
Unlocked Jun 1, 2010 @ 9:03am

Follow Freeman

Gain command of a squad of rebels in the uprising.
Unlocked Feb 25, 2011 @ 11:48am

Radiation Levels Detected

Get through the toxic tunnel under City 17 in Half-Life 2.
Unlocked Feb 25, 2011 @ 12:10pm

Plaza Defender

Survive the generator plaza standoff in chapter Anticitizen One.
Unlocked Mar 5, 2011 @ 9:25am

Counter-Sniper

Kill all of the snipers in City 17.
Unlocked Feb 25, 2011 @ 12:57pm

Fight the Power

Shut down the supression device by disabling its generators.
Unlocked Feb 25, 2011 @ 1:17pm

Giant Killer

Survive the rooftop strider battle in the ruins of City 17.
Unlocked Feb 25, 2011 @ 1:38pm

Atomizer

Disintegrate 15 soldiers by throwing them into a Combine ball field.
Unlocked Jun 2, 2010 @ 1:55am

Singularity Collapse

Destroy the Citadel's reactor core.
Unlocked Mar 5, 2011 @ 10:34am

Hack Attack!

Kill five enemies with a Manhack.



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.

Lambda Locator

Find all lambda caches in Half-Life 2.
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