It's impossible for me to achieve platinum. I'd have to do a drift event, and take some pictures of people. Not sure if I can gold Vettel or Eiger, but I'll probably never find out since I can't get Platinum anyway.
Most of the licenses aren't too bad once you're used to the game, if you get stuck just stop and do some other things for a while. They'll probably be easier when you come back. There are a handful that are pretty tricky, but watching videos should show you most of what is holding you back.