Welcome to the walkthrough for Metal Gear Solid V: The Phantom Pain. Like all games in the series, expect a long completion time but a lot of fun in doing so. This game is more gameplay-oriented as opposed to the rest of the series having a higher focus on story, making for a lot of interesting mechanics. The Phantom Pain is technically a sequel to Ground Zeroes, but is more importantly a sequel to Metal Gear Solid: Peace Walker. If you're interested in the story and don't want to play anything out of order, you should consider playing that first; it's available on the PSP and PS3.
Since there's so much stuff to do in the game, the walkthrough is structured to encourage playing through the game's Main Ops (missions) three times. You'll already have to do them three times for completion, but doing them back-to-back instead of intertwined serves a few purposes. First, you'll complete a mission, then you'll need an S Rank on it and will have to complete the various Mission Tasks attached to that mission. Going through the story first at a slower pace without worrying about the two latter objectives until later will help you familiarize yourself with the game and grants lots of time for weapon and item development, which will in turn make the S Ranks and Mission Tasks far easier to accomplish. You can always go ahead and finish a mission's other objectives whenever you think you're ready, but the walkthrough will assume that you're going in after you've finished all of the Main Ops at least once beforehand.
There are no trophies tied to multiplayer, but feel free to check out the mode if you like.
Finally, there are lots of DLC items available for the single-player experience to enhance gameplay. None of them are game-changers, and none are necessary for completion, but they can be pretty handy/useful. You're also able to unlock a few items for development by completing certain tasks in Metal Gear Solid V: Ground Zeroes by connecting the game's progress to that of The Phantom Pain. These items are also non-essential, but are a great nod to the series for those who have been invested in it since its early roots.
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