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40 of 69 (58%) achievements earned:
Personal Achievements
 

Defiant

Hit the trashcan cop with the can.
Unlocked Jan 7, 2016 @ 8:47am

Submissive

Put the can in the trash.
Unlocked Jan 14, 2016 @ 6:43am

Malcontent

Escape the apartment block raid.
Unlocked Jan 7, 2016 @ 9:02am

What cat?

Break the mini-teleporter in Kleiner's lab.
Unlocked Jan 7, 2016 @ 9:08am

Trusty Hardware

Get the crowbar.
Unlocked Jan 7, 2016 @ 9:14am

Barnacle Bowling

Kill five barnacles with one barrel.
Unlocked Jan 7, 2016 @ 9:37am

Anchor's Aweigh!

Get the airboat.
Unlocked Mar 26, 2016 @ 4:06am

Heavy Weapons

Get the airboat's mounted gun.
Unlocked Apr 8, 2016 @ 8:09am

Vorticough

Discover the hidden singing vortigaunt cave in chapter Water Hazard.
Unlocked Jan 27, 2019 @ 3:52am

Revenge!

Destroy the hunter-chopper in Half-Life 2.
Unlocked Apr 8, 2016 @ 8:29am

Blast from the Past

Find the HEV Suit Charger faceplate in Eli's scrapyard.
Unlocked Apr 22, 2016 @ 8:36am

Zero-Point Energy

Get the Gravity Gun in Black Mesa East.
Unlocked Apr 22, 2016 @ 8:34am

Two Points

Use DOG's ball to make a basket in Eli's scrapyard.
Unlocked Jun 29, 2017 @ 8:34pm

Zombie Chopper

Play through Ravenholm using only the Gravity Gun.
Unlocked Jan 26, 2019 @ 2:51am

Hallowed Ground

Escort Gregori safely through the church cemetery.
Unlocked Apr 24, 2016 @ 9:11am

OSHA Violation

Kill 3 enemies using the crane.
Unlocked Apr 25, 2016 @ 6:46pm

Targetted Advertising

Pin a soldier to the billboard in chapter Highway 17.
Unlocked Feb 3, 2019 @ 1:00am

Where Cubbage Fears to Tread

Defend Little Odessa from the gunship attack.
Unlocked Apr 25, 2016 @ 6:39pm

One Man Army

Destroy six gunships in Half-Life 2.
Unlocked Jul 2, 2017 @ 4:59am

Keep Off the Sand!

Cross the antlion beach in chapter Sandtraps without touching the sand.
Unlocked Jan 26, 2019 @ 10:31pm

Bug Hunt

Use the antlions to kill 50 enemies.
Unlocked Jul 5, 2016 @ 3:49am

Flushed

Kill an enemy with a toilet.
Unlocked Feb 2, 2019 @ 8:36pm

Warden Freeman

Survive the second turret standoff in Nova Prospekt.
Unlocked Feb 3, 2019 @ 1:14am

Follow Freeman

Gain command of a squad of rebels in the uprising.
Unlocked Jul 17, 2016 @ 9:16am

Radiation Levels Detected

Get through the toxic tunnel under City 17 in Half-Life 2.
Unlocked Feb 2, 2019 @ 9:26pm

Plaza Defender

Survive the generator plaza standoff in chapter Anticitizen One.
Unlocked Feb 3, 2019 @ 1:24am

Counter-Sniper

Kill all of the snipers in City 17.
Unlocked Feb 3, 2019 @ 12:38am

Fight the Power

Shut down the supression device by disabling its generators.
Unlocked Feb 3, 2019 @ 12:49am

Giant Killer

Survive the rooftop strider battle in the ruins of City 17.
Unlocked Feb 2, 2019 @ 11:29pm

Atomizer

Disintegrate 15 soldiers by throwing them into a Combine ball field.
Unlocked Feb 3, 2019 @ 12:34am

Singularity Collapse

Destroy the Citadel's reactor core.