I have read about extreme difficulty missions, but how to you unlock them ?
Extreme difficulty missions in Metal Gear Solid V: The Phantom Pain are unlocked as part of the main story missions. After the end of Chapter 1 you will get your first extreme missions.
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2Yes, in the intro of the game it states "Chapter 1: Revenge" there are two chapters in the game. At the end of Chapter 1 you will see the Chapter's credits and then get a teaser and the title of Chapter 2, then you will unlock the first Extreme mission. Some speculate more Chapters will be added as DLC – Lucky Red Sep 12 '15 at 16:05