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

Defiant

Hit the trashcan cop with the can.
Unlocked May 22, 2023 @ 1:55pm

Giant Killer

Survive the rooftop strider battle in the ruins of City 17.
Unlocked Jul 6, 2023 @ 1:54pm

Hallowed Ground

Escort Gregori safely through the church cemetery.
Unlocked Jun 3, 2023 @ 11:25am

Keep Off the Sand!

Cross the antlion beach in chapter Sandtraps without touching the sand.
Unlocked Jun 30, 2023 @ 5:13pm

Singularity Collapse

Destroy the Citadel's reactore core.
Unlocked Jul 6, 2023 @ 2:58pm

Plaza Defender

Survive the generator plaza standoff in chapter Anticitizen One.
Unlocked Jul 5, 2023 @ 3:25pm

Zombie Chopper

Play through Ravenholm using only the Gravity Gun.
Unlocked Jul 10, 2023 @ 10:12am

Fight the Power

Shut down the supression device by disabling its generators.
Unlocked Jul 5, 2023 @ 4:25pm

Radiation Levels Detected

Get through the toxic tunnel under City 17 in Half-Life 2.
Unlocked Jul 1, 2023 @ 9:22pm

Warden Freeman

Survive the second turret standoff in Nova Prospekt.
Unlocked Jul 1, 2023 @ 4:57pm

What cat?

Break the mini-teleporter in Kleiner's Lab.
Unlocked May 22, 2023 @ 2:09pm

Atomizer

Disintegrate 15 soldiers by throwing them into a Combine ball field.
Unlocked Jul 6, 2023 @ 2:14pm

Malcontent

Escape the apartment block raid.
Unlocked May 22, 2023 @ 2:04pm

Lambda Locator

Find all lambda caches in Half-Life 2.
Unlocked Jul 10, 2023 @ 4:53pm

Blast from the Past

Find the HEV Suit Charger faceplate in Eli's scrapyard.
Unlocked May 23, 2023 @ 12:15pm

Vorticough

Discover the hidden singing vortigaunt cave in chapter Water Hazard.
Unlocked May 23, 2023 @ 12:01pm

Follow Freeman

Gain command of a squad of rebels in the uprising.
Unlocked Jul 1, 2023 @ 5:19pm

Anchor's Aweigh!

Get the airboat.
Unlocked May 22, 2023 @ 2:44pm

Heavy Weapons

Get the airboat's mounted gun.
Unlocked May 23, 2023 @ 11:46am

Trusty Hardware

Get the crowbar.
Unlocked May 22, 2023 @ 2:17pm

Zero-Point Energy

Get the Gravity Gun in Black Mesa East.
Unlocked May 23, 2023 @ 12:14pm

Counter-Sniper

Kill all of the snipers in City 17.
Unlocked Jul 5, 2023 @ 3:51pm

Barnacle Bowling

Kill five barnacles with one explosive barrel.
Unlocked May 22, 2023 @ 2:28pm

Revenge!

Destroy the Hunter-Chopper.
Unlocked May 23, 2023 @ 11:59am

Bug Hunt

Use the Antlions to kill 50 enemies.
Unlocked Jun 30, 2023 @ 5:32pm

OSHA Violation

Kill 3 enemies using the crane.
Unlocked Jun 6, 2023 @ 5:11pm

Flushed

Kill an enemy with a toilet.
Unlocked May 23, 2023 @ 12:25pm

Where Cubbage Fears to Tread

Defend Little Odessa from the Gunship attack.
Unlocked Jun 4, 2023 @ 10:37am

Two Points

Use Dog's ball to make a basket in the scrapyard.
Unlocked May 23, 2023 @ 12:23pm

Targeted Advertising

Pin a soldier to the billboard in the chapter Highway 17.
Unlocked Jun 28, 2023 @ 5:46pm

Submissive

Put the can in the trash.
Unlocked May 22, 2023 @ 1:56pm

One Man Army

Destroy six gunships in Half-Life 2.
Unlocked Jun 30, 2023 @ 5:37pm

Hack Attack!

Kill five enemies with a Manhack.
Unlocked Jul 10, 2023 @ 10:40am