Legendary Battle Achievement in Forza Motorsport 4
Beat a Ferrari 330 P4 in any race while driving a Ford GT40 Mark II.
How to unlock Legendary Battle
Just get a friend to go online and do a lap of the speedway in the Ferrari and beat him... or if you don't have any friends and are feeling up for a challenge, you can always find ways to earn this by yourself, I'm sure of it. It's simple, find someone who's in the Ferrari 330 P4 and then beat them in the Ford GT40 Mark II - that's the hard part though.