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

Defiant

Hit the trashcan cop with the can.
Unlocked Aug 1, 2023 @ 10:46am

Giant Killer

Survive the rooftop strider battle in the ruins of City 17.
Unlocked Aug 17, 2023 @ 8:09pm

Hallowed Ground

Escort Gregori safely through the church cemetery.
Unlocked Aug 15, 2023 @ 12:29pm

Keep Off the Sand!

Cross the antlion beach in chapter Sandtraps without touching the sand.
Unlocked Aug 15, 2023 @ 9:37pm

Singularity Collapse

Destroy the Citadel's reactore core.
Unlocked Aug 17, 2023 @ 9:05pm

Plaza Defender

Survive the generator plaza standoff in chapter Anticitizen One.
Unlocked Aug 17, 2023 @ 5:19pm

Zombie Chopper

Play through Ravenholm using only the Gravity Gun.
Unlocked Aug 15, 2023 @ 12:46pm

Fight the Power

Shut down the supression device by disabling its generators.
Unlocked Aug 17, 2023 @ 7:14pm

Radiation Levels Detected

Get through the toxic tunnel under City 17 in Half-Life 2.
Unlocked Aug 17, 2023 @ 4:50pm

Warden Freeman

Survive the second turret standoff in Nova Prospekt.
Unlocked Aug 16, 2023 @ 9:34pm

What cat?

Break the mini-teleporter in Kleiner's Lab.
Unlocked Sep 29, 2017 @ 11:39am

Atomizer

Disintegrate 15 soldiers by throwing them into a Combine ball field.
Unlocked Aug 17, 2023 @ 8:32pm

Malcontent

Escape the apartment block raid.
Unlocked Sep 29, 2017 @ 11:34am

Lambda Locator

Find all lambda caches in Half-Life 2.
Unlocked Aug 18, 2023 @ 4:01pm

Blast from the Past

Find the HEV Suit Charger faceplate in Eli's scrapyard.
Unlocked Aug 17, 2023 @ 9:58pm

Vorticough

Discover the hidden singing vortigaunt cave in chapter Water Hazard.
Unlocked Aug 12, 2023 @ 5:30pm

Follow Freeman

Gain command of a squad of rebels in the uprising.
Unlocked Aug 17, 2023 @ 11:14am

Anchor's Aweigh!

Get the airboat.
Unlocked Aug 2, 2023 @ 11:21am

Heavy Weapons

Get the airboat's mounted gun.
Unlocked Aug 5, 2023 @ 12:40pm

Trusty Hardware

Get the crowbar.
Unlocked Sep 29, 2017 @ 11:47am

Zero-Point Energy

Get the Gravity Gun in Black Mesa East.
Unlocked Aug 13, 2023 @ 8:49am

Counter-Sniper

Kill all of the snipers in City 17.
Unlocked Aug 17, 2023 @ 6:14pm

Barnacle Bowling

Kill five barnacles with one explosive barrel.
Unlocked Aug 2, 2023 @ 10:27am

Revenge!

Destroy the Hunter-Chopper.
Unlocked Aug 12, 2023 @ 5:17pm

Bug Hunt

Use the Antlions to kill 50 enemies.
Unlocked Aug 16, 2023 @ 7:18pm

OSHA Violation

Kill 3 enemies using the crane.
Unlocked Aug 15, 2023 @ 1:51pm

Flushed

Kill an enemy with a toilet.
Unlocked Aug 17, 2023 @ 6:06pm

Where Cubbage Fears to Tread

Defend Little Odessa from the Gunship attack.
Unlocked Aug 15, 2023 @ 1:32pm

Two Points

Use Dog's ball to make a basket in the scrapyard.
Unlocked Aug 13, 2023 @ 9:03am

Targeted Advertising

Pin a soldier to the billboard in the chapter Highway 17.
Unlocked Aug 15, 2023 @ 2:24pm

Submissive

Put the can in the trash.
Unlocked Aug 17, 2023 @ 9:47pm

One Man Army

Destroy six gunships in Half-Life 2.
Unlocked Aug 16, 2023 @ 6:59pm

Hack Attack!

Kill five enemies with a Manhack.
Unlocked Aug 16, 2023 @ 9:18pm