Monster Hunter: World
First yes there will be in missions but in expeditions you can free roam forever. Second Yeah you could do it solo I guess but It a lot more fun with friends so I don't recommend it.
Yes, it does require PS + to play online. Whole game can be played solo however, and I've actually done that a great deal before even going online to play.
you cannot pause at all
About 25-35 gigabytes
You cannot split screen co-op.
yes of course
Yes if you want to play with friends. But there is an offline mode as well.
No, when you preorder the game you get a charm and the origin armor set. The stuff your talking about is in digital delux and collecters edition