The Orange Box achievements

Discover the hidden singing vortigaunt cave in chapter Water Hazard.

Beat DOG in a race to the White Forest base.

Use the cars to squash 15 antlions in Episode One.

Don't let any citizens die when escorting them to the escape train.

Run over 20 enemies with the car in Episode Two.

Pin a soldier to the billboard in chapter Highway 17.

Kill five enemies with the same energy ball.

Jump 300 feet.

Find the HEV Suit Charger faceplate in Eli's scrapyard.

Kill a Combine soldier with his own grenade.

Disintegrate 15 soldiers by throwing them into a Combine ball field.

Find every radar cache in chapter Under The Radar.