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33 of 33 (100%) achievements earned:

Personal Achievements
 
Unlocked Feb 4, 2016 @ 5:53am

Defiant

Hit the trashcan cop with the can.
Unlocked Jul 21, 2013 @ 2:42am

Submissive

Put the can in the trash.
Unlocked Jul 21, 2013 @ 2:47am

Malcontent

Escape the apartment block raid.
Unlocked Jan 27, 2016 @ 1:40am

What cat?

Break the mini-teleporter in Kleiner's lab.
Unlocked Jul 21, 2013 @ 3:25am

Trusty Hardware

Get the crowbar.
Unlocked Jul 21, 2013 @ 3:51am

Barnacle Bowling

Kill five barnacles with one barrel.
Unlocked Jul 22, 2013 @ 4:51am

Anchor's Aweigh!

Get the airboat.
Unlocked Jul 24, 2013 @ 1:46am

Heavy Weapons

Get the airboat's mounted gun.
Unlocked Jul 24, 2013 @ 2:00am

Vorticough

Discover the hidden singing vortigaunt cave in chapter Water Hazard.
Unlocked Jul 24, 2013 @ 1:56am

Revenge!

Destroy the hunter-chopper in Half-Life 2.
Unlocked Jul 24, 2013 @ 2:13am

Blast from the Past

Find the HEV Suit Charger faceplate in Eli's scrapyard.
Unlocked Jul 24, 2013 @ 2:12am

Zero-Point Energy

Get the Gravity Gun in Black Mesa East.
Unlocked Feb 4, 2016 @ 9:17am

Two Points

Use DOG's ball to make a basket in Eli's scrapyard.
Unlocked Jan 28, 2016 @ 2:15am

Zombie Chopper

Play through Ravenholm using only the Gravity Gun.
Unlocked Jul 24, 2013 @ 3:19am

Hallowed Ground

Escort Gregori safely through the church cemetery.
Unlocked Jan 29, 2016 @ 11:36pm

OSHA Violation

Kill 3 enemies using the crane.
Unlocked Jan 29, 2016 @ 11:45pm

Targetted Advertising

Pin a soldier to the billboard in chapter Highway 17.
Unlocked Jul 25, 2013 @ 12:34am

Where Cubbage Fears to Tread

Defend Little Odessa from the gunship attack.
Unlocked Jan 31, 2016 @ 2:05am

One Man Army

Destroy six gunships in Half-Life 2.
Unlocked Jan 31, 2016 @ 1:40am

Keep Off the Sand!

Cross the antlion beach in chapter Sandtraps without touching the sand.
Unlocked Jan 31, 2016 @ 2:11am

Bug Hunt

Use the antlions to kill 50 enemies.
Unlocked Jan 31, 2016 @ 2:07am

Flushed

Kill an enemy with a toilet.
Unlocked Jan 31, 2016 @ 3:16am

Warden Freeman

Survive the second turret standoff in Nova Prospekt.
Unlocked Feb 3, 2016 @ 12:44am

Follow Freeman

Gain command of a squad of rebels in the uprising.
Unlocked Feb 3, 2016 @ 1:03am

Radiation Levels Detected

Get through the toxic tunnel under City 17 in Half-Life 2.
Unlocked Feb 3, 2016 @ 1:21am

Plaza Defender

Survive the generator plaza standoff in chapter Anticitizen One.
Unlocked Feb 3, 2016 @ 1:38am

Counter-Sniper

Kill all of the snipers in City 17.
Unlocked Feb 3, 2016 @ 5:47am

Fight the Power

Shut down the supression device by disabling its generators.
Unlocked Feb 4, 2016 @ 5:34am

Giant Killer

Survive the rooftop strider battle in the ruins of City 17.
Unlocked Feb 4, 2016 @ 6:13am

Atomizer

Disintegrate 15 soldiers by throwing them into a Combine ball field.
Unlocked Feb 4, 2016 @ 9:41am

Singularity Collapse

Destroy the Citadel's reactor core.
Unlocked Feb 3, 2016 @ 6:08am

Lambda Locator

Find all lambda caches in Half-Life 2.
Unlocked Jan 31, 2016 @ 2:33am

Hack Attack!

Kill five enemies with a Manhack.