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