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33 of 33 (100%) achievements earned:
Personal Achievements
 

Defiant

Hit the trashcan cop with the can.
Unlocked Jul 4, 2010 @ 8:34am

Submissive

Put the can in the trash.
Unlocked Jun 26, 2019 @ 2:57pm

Malcontent

Escape the apartment block raid.
Unlocked Jul 4, 2010 @ 8:41am

What cat?

Break the mini-teleporter in Kleiner's lab.
Unlocked Jul 4, 2010 @ 8:48am

Trusty Hardware

Get the crowbar.
Unlocked Jul 4, 2010 @ 8:57am

Barnacle Bowling

Kill five barnacles with one barrel.
Unlocked Jul 4, 2010 @ 9:16am

Anchor's Aweigh!

Get the airboat.
Unlocked Jul 5, 2010 @ 2:32am

Heavy Weapons

Get the airboat's mounted gun.
Unlocked Jun 29, 2019 @ 3:26am

Vorticough

Discover the hidden singing vortigaunt cave in chapter Water Hazard.
Unlocked Jun 29, 2019 @ 3:49am

Revenge!

Destroy the hunter-chopper in Half-Life 2.
Unlocked Jun 29, 2019 @ 3:44am

Blast from the Past

Find the HEV Suit Charger faceplate in Eli's scrapyard.
Unlocked Jun 29, 2019 @ 4:10am

Zero-Point Energy

Get the Gravity Gun in Black Mesa East.
Unlocked Jun 29, 2019 @ 4:08am

Two Points

Use DOG's ball to make a basket in Eli's scrapyard.
Unlocked Jun 29, 2019 @ 4:16am

Zombie Chopper

Play through Ravenholm using only the Gravity Gun.
Unlocked Jun 29, 2019 @ 6:21am

Hallowed Ground

Escort Gregori safely through the church cemetery.
Unlocked Jun 29, 2019 @ 6:00am

OSHA Violation

Kill 3 enemies using the crane.
Unlocked Jun 29, 2019 @ 7:19am

Targetted Advertising

Pin a soldier to the billboard in chapter Highway 17.
Unlocked Jun 29, 2019 @ 8:01am

Where Cubbage Fears to Tread

Defend Little Odessa from the gunship attack.
Unlocked Jun 29, 2019 @ 7:11am

One Man Army

Destroy six gunships in Half-Life 2.
Unlocked Jul 1, 2019 @ 1:10pm

Keep Off the Sand!

Cross the antlion beach in chapter Sandtraps without touching the sand.
Unlocked Jul 1, 2019 @ 11:44am

Bug Hunt

Use the antlions to kill 50 enemies.
Unlocked Jul 1, 2019 @ 12:35pm

Flushed

Kill an enemy with a toilet.
Unlocked Jul 5, 2019 @ 1:19pm

Warden Freeman

Survive the second turret standoff in Nova Prospekt.
Unlocked Jul 5, 2019 @ 2:54pm

Follow Freeman

Gain command of a squad of rebels in the uprising.
Unlocked Jul 6, 2019 @ 3:50am

Radiation Levels Detected

Get through the toxic tunnel under City 17 in Half-Life 2.
Unlocked Jul 6, 2019 @ 4:29am

Plaza Defender

Survive the generator plaza standoff in chapter Anticitizen One.
Unlocked Jul 6, 2019 @ 5:20am

Counter-Sniper

Kill all of the snipers in City 17.
Unlocked Jul 6, 2019 @ 6:39am

Fight the Power

Shut down the supression device by disabling its generators.
Unlocked Jul 6, 2019 @ 7:29am

Giant Killer

Survive the rooftop strider battle in the ruins of City 17.
Unlocked Jul 6, 2019 @ 8:00am

Atomizer

Disintegrate 15 soldiers by throwing them into a Combine ball field.
Unlocked Jul 7, 2019 @ 2:28am

Singularity Collapse

Destroy the Citadel's reactor core.
Unlocked Jul 7, 2019 @ 2:57am

Lambda Locator

Find all lambda caches in Half-Life 2.
Unlocked Jul 6, 2019 @ 7:50am

Hack Attack!

Kill five enemies with a Manhack.
Unlocked Jul 5, 2019 @ 1:49pm