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Secret Achievements (Show)
Half-Life 2 achievements
Play through Ravenholm using only the Gravity Gun.
Get the Gravity Gun in Black Mesa East.
Where Cubbage Fears to Tread
Defend Little Odessa from the gunship attack.
Break the mini-teleporter in Kleiner's lab.
Survive the second turret standoff in Nova Prospekt.
Discover the hidden singing vortigaunt cave in chapter Water Hazard.
Use DOG's ball to make a basket in Eli's scrapyard.
Get the crowbar.
Pin a soldier to the billboard in chapter Highway 17.
Put the can in the trash.
Destroy the Citadel's reactor core.
Destroy the hunter-chopper in Half-Life 2.
Radiation Levels Detected
Get through the toxic tunnel under City 17 in Half-Life 2.
Survive the generator plaza standoff in chapter Anticitizen One.
Kill 3 enemies using the crane.
One Man Army
Destroy six gunships in Half-Life 2.
Escape the apartment block raid.
Find all lambda caches in Half-Life 2.
Keep Off the Sand!
Cross the antlion beach in chapter Sandtraps without touching the sand.
Get the airboat's mounted gun.
Escort Gregori safely through the church cemetery.
Kill five enemies with a Manhack.
Survive the rooftop strider battle in the ruins of City 17.
Gain command of a squad of rebels in the uprising.
Kill an enemy with a toilet.
Fight the Power
Shut down the supression device by disabling its generators.
Hit the trashcan cop with the can.
Kill all of the snipers in City 17.
Use the antlions to kill 50 enemies.
Blast from the Past
Find the HEV Suit Charger faceplate in Eli's scrapyard.
Kill five barnacles with one barrel.
Disintegrate 15 soldiers by throwing them into a Combine ball field.
Get the airboat.