I've been perusing google for a while to answer my question(s) but all that seems to come up are guides on how to get Collectibles, Ribbons or Achievements.
I've gotten quite a few of the collectibles in each of the missions as I've played them, and I've already earned a lot of ribbons and medals for various accomplishments or (killing) tasks.
My question is, what do these actually get you, if anything?
Is there some sort of money (in-game credits for guns etc) that you get? EXP towards leveling up? Skins for guns? Or is it for show?
I think some of them warrant Achievements/PSN Trophies, but I'm not sure if that's all they are for.