Kill five barnacles with one barrel.
Get the crowbar.
Shut down the supression device by disabling its generators.
Survive the second turret standoff in Nova Prospekt.
Gain command of a squad of rebels in the uprising.
Get through the toxic tunnel under City 17 in Half-Life 2.
Survive the generator plaza standoff in chapter Anticitizen One.
Kill all of the snipers in City 17.
Survive the rooftop strider battle in the ruins of City 17.
Kill an enemy with a toilet.
Find all lambda caches in Half-Life 2.
Discover the hidden singing vortigaunt cave in chapter Water Hazard.
Play through Ravenholm using only the Gravity Gun.
Disintegrate 15 soldiers by throwing them into a Combine ball field.
Destroy six gunships in Half-Life 2.
Use the antlions to kill 50 enemies.
Cross the antlion beach in chapter Sandtraps without touching the sand.
Pin a soldier to the billboard in chapter Highway 17.
Kill 3 enemies using the crane.
Use DOG's ball to make a basket in Eli's scrapyard.
Get the Gravity Gun in Black Mesa East.
Find the HEV Suit Charger faceplate in Eli's scrapyard.
Destroy the hunter-chopper in Half-Life 2.
Get the airboat's mounted gun.
Get the airboat.
Break the mini-teleporter in Kleiner's lab.
Escape the apartment block raid.
Kill five enemies with a Manhack.
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