are ALL the trophies listed under a game on the Vita, required in order to get the platinum trophy? no exceptions?
and if not, are speed trophies required to platinum on rayman on vita?
Yes, it is required. I got the platinum for Rayman Origins(on PS3) and man it was a lot of work. Just be patient and you'll have it in no time.
Now if there were DLC trophies, those wouldn't be necessary for platinum. But there's not even any DLC announced as far as I know.