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

Defiant

Hit the trashcan cop with the can.
Unlocked Jan 1, 2017 @ 3:14pm

Submissive

Put the can in the trash.
Unlocked Jan 1, 2017 @ 3:07pm

Malcontent

Escape the apartment block raid.
Unlocked Jan 1, 2017 @ 3:24pm

What cat?

Break the mini-teleporter in Kleiner's lab.
Unlocked Apr 25, 2021 @ 10:43am

Trusty Hardware

Get the crowbar.
Unlocked Jan 1, 2017 @ 3:36pm

Barnacle Bowling

Kill five barnacles with one barrel.
Unlocked Apr 25, 2021 @ 9:04am

Anchor's Aweigh!

Get the airboat.
Unlocked Feb 8, 2017 @ 4:28am

Heavy Weapons

Get the airboat's mounted gun.
Unlocked Apr 25, 2021 @ 11:21am

Vorticough

Discover the hidden singing vortigaunt cave in chapter Water Hazard.
Unlocked Apr 25, 2021 @ 11:38am

Revenge!

Destroy the hunter-chopper in Half-Life 2.
Unlocked Apr 25, 2021 @ 11:35am

Blast from the Past

Find the HEV Suit Charger faceplate in Eli's scrapyard.
Unlocked Apr 25, 2021 @ 11:53am

Zero-Point Energy

Get the Gravity Gun in Black Mesa East.
Unlocked Apr 25, 2021 @ 11:52am

Two Points

Use DOG's ball to make a basket in Eli's scrapyard.
Unlocked Apr 25, 2021 @ 12:07pm

Zombie Chopper

Play through Ravenholm using only the Gravity Gun.
Unlocked Apr 27, 2021 @ 2:32am

Hallowed Ground

Escort Gregori safely through the church cemetery.
Unlocked Apr 27, 2021 @ 1:51am

OSHA Violation

Kill 3 enemies using the crane.
Unlocked Apr 27, 2021 @ 9:12am

Targetted Advertising

Pin a soldier to the billboard in chapter Highway 17.
Unlocked Apr 27, 2021 @ 9:34am

Where Cubbage Fears to Tread

Defend Little Odessa from the gunship attack.
Unlocked Apr 27, 2021 @ 9:04am

One Man Army

Destroy six gunships in Half-Life 2.
Unlocked Apr 29, 2021 @ 3:29am

Keep Off the Sand!

Cross the antlion beach in chapter Sandtraps without touching the sand.
Unlocked Apr 29, 2021 @ 3:02am

Bug Hunt

Use the antlions to kill 50 enemies.
Unlocked Apr 29, 2021 @ 3:24am

Flushed

Kill an enemy with a toilet.
Unlocked Apr 29, 2021 @ 4:18am

Warden Freeman

Survive the second turret standoff in Nova Prospekt.
Unlocked Apr 30, 2021 @ 10:28am

Follow Freeman

Gain command of a squad of rebels in the uprising.
Unlocked Apr 30, 2021 @ 10:48am

Radiation Levels Detected

Get through the toxic tunnel under City 17 in Half-Life 2.
Unlocked Apr 30, 2021 @ 11:18am

Plaza Defender

Survive the generator plaza standoff in chapter Anticitizen One.
Unlocked May 2, 2021 @ 3:15am

Counter-Sniper

Kill all of the snipers in City 17.
Unlocked May 2, 2021 @ 3:51am

Fight the Power

Shut down the supression device by disabling its generators.
Unlocked May 2, 2021 @ 9:21am

Giant Killer

Survive the rooftop strider battle in the ruins of City 17.
Unlocked May 2, 2021 @ 9:54am

Atomizer

Disintegrate 15 soldiers by throwing them into a Combine ball field.
Unlocked May 2, 2021 @ 10:12am

Singularity Collapse

Destroy the Citadel's reactor core.
Unlocked May 2, 2021 @ 10:59am

Lambda Locator

Find all lambda caches in Half-Life 2.
Unlocked May 2, 2021 @ 9:41am

Hack Attack!

Kill five enemies with a Manhack.
Unlocked Apr 30, 2021 @ 10:03am