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33 of 33 (100%) achievements earned:

Personal Achievements
 

Defiant

Hit the trashcan cop with the can.
Unlocked May 17, 2020 @ 3:20am

Giant Killer

Survive the rooftop strider battle in the ruins of City 17.
Unlocked May 18, 2020 @ 5:46am

Hallowed Ground

Escort Gregori safely through the church cemetery.
Unlocked May 17, 2020 @ 8:53am

Keep Off the Sand!

Cross the antlion beach in chapter Sandtraps without touching the sand.
Unlocked May 18, 2020 @ 1:48am

Singularity Collapse

Destroy the Citadel's reactore core.
Unlocked May 18, 2020 @ 6:18am

Plaza Defender

Survive the generator plaza standoff in chapter Anticitizen One.
Unlocked May 18, 2020 @ 4:53am

Zombie Chopper

Play through Ravenholm using only the Gravity Gun.
Unlocked May 17, 2020 @ 8:58am

Fight the Power

Shut down the supression device by disabling its generators.
Unlocked May 18, 2020 @ 5:23am

Radiation Levels Detected

Get through the toxic tunnel under City 17 in Half-Life 2.
Unlocked May 18, 2020 @ 4:36am

Warden Freeman

Survive the second turret standoff in Nova Prospekt.
Unlocked May 18, 2020 @ 3:58am

What cat?

Break the mini-teleporter in Kleiner's Lab.
Unlocked May 17, 2020 @ 3:28am

Atomizer

Disintegrate 15 soldiers by throwing them into a Combine ball field.
Unlocked May 18, 2020 @ 6:02am

Malcontent

Escape the apartment block raid.
Unlocked May 17, 2020 @ 3:23am

Lambda Locator

Find all lambda caches in Half-Life 2.
Unlocked May 18, 2020 @ 5:39am

Blast from the Past

Find the HEV Suit Charger faceplate in Eli's scrapyard.
Unlocked May 17, 2020 @ 6:07am

Vorticough

Discover the hidden singing vortigaunt cave in chapter Water Hazard.
Unlocked May 17, 2020 @ 5:55am

Follow Freeman

Gain command of a squad of rebels in the uprising.
Unlocked May 18, 2020 @ 4:15am

Anchor's Aweigh!

Get the airboat.
Unlocked May 17, 2020 @ 5:16am

Heavy Weapons

Get the airboat's mounted gun.
Unlocked May 17, 2020 @ 5:45am

Trusty Hardware

Get the crowbar.
Unlocked May 17, 2020 @ 3:35am

Zero-Point Energy

Get the Gravity Gun in Black Mesa East.
Unlocked May 17, 2020 @ 6:07am

Counter-Sniper

Kill all of the snipers in City 17.
Unlocked May 18, 2020 @ 5:08am

Barnacle Bowling

Kill five barnacles with one explosive barrel.
Unlocked May 17, 2020 @ 4:43am

Revenge!

Destroy the Hunter-Chopper.
Unlocked May 17, 2020 @ 5:54am

Bug Hunt

Use the Antlions to kill 50 enemies.
Unlocked May 18, 2020 @ 2:23am

OSHA Violation

Kill 3 enemies using the crane.
Unlocked May 17, 2020 @ 9:24am

Flushed

Kill an enemy with a toilet.
Unlocked May 18, 2020 @ 2:09am

Where Cubbage Fears to Tread

Defend Little Odessa from the Gunship attack.
Unlocked May 17, 2020 @ 9:18am

Two Points

Use Dog's ball to make a basket in the scrapyard.
Unlocked May 17, 2020 @ 6:11am

Targeted Advertising

Pin a soldier to the billboard in the chapter Highway 17.
Unlocked May 18, 2020 @ 1:03am

Submissive

Put the can in the trash.
Unlocked May 17, 2020 @ 3:20am

One Man Army

Destroy six gunships in Half-Life 2.
Unlocked May 18, 2020 @ 2:07am

Hack Attack!

Kill five enemies with a Manhack.
Unlocked May 18, 2020 @ 2:21am