Half-Life 2 achievements

Survive the rooftop strider battle in the ruins of City 17.

Shut down the supression device by disabling its generators.

Survive the generator plaza standoff in chapter Anticitizen One.

Get through the toxic tunnel under City 17 in Half-Life 2.

Gain command of a squad of rebels in the uprising.

Survive the second turret standoff in Nova Prospekt.

Use the antlions to kill 50 enemies.

Kill five barnacles with one barrel.

Get the Gravity Gun in Black Mesa East.

Destroy the hunter-chopper in Half-Life 2.

Get the airboat's mounted gun.

Get the airboat.