What ever it says it means "no hogs or scorpions." a hog = warthog a scorpion = scorpion tank. They r the only thingss you can't use at all! That means you can use anything but the hog or scorpion. examples (u can use) ghost, aa wraith, wraith, chopper, banshee- hard to hijack, phantom- if u can reach it you can hijack it, stand on elephant or behind- don't reccomend, mongooses- inside first tunnel with 4 rocket launchers- 998 rockets, or anytrhing else but hog or scorpion tank, OK!
It took me 48 minutes with mongooses.
tip, to do classic you can't shoot or throw grenades at all. if you hijack a ghost you can't fire same with warthog turret. Your teamate/computer people can shoot the turret to do the killin though. It is easier to race through on a ghost. Splatter them all!!! Rumor has it if you honk the horn it counts as a shot SO DON'T TRY IT IF YOU WANT THE ACHIEVEMENT.
Have fun,
Abtheverybad