(SPOILERS) How To Get The BEST ENDING Possible!
With this ending, you will:
Save Alex Mason, Frank Woods and stop Menendez's Invasion to save the world!
ALL STRIKE FORCE MISSIONS MUST BE COMPLETED!
Chapter 1: Pyrrhic Victory
Chapter 2: Celerium
Chapter 3: Old Wounds
After you hold off the Russian attack at the end of the chapter, you will start interrogating Kravchenko, and Mason will be very tempted to kill him. You will need to resist by spamming the use key in order to learn about the mole in the CIA. (This part is crucial for doing the next step in the following chapter 'Time And Fate'.
Chapter 4: Time And Fate
Chapter 5: Fallen Angel
Chapter 6: Karma
Chapter 7: Suffer With Me
Towards the end of this chapter, you will get to a rooftop with Noriega, and will be ordered by Hudson to kill Nexus target who's confirmed to be Menendez, it's not him, It's Mason, you will need to shoot him in the leg, when you do, Hudson will again order you to shoot him in the head, don't, shoot his leg again, and the next cutscene will trigger.

Chapter 8: Achilles Veil
Chapter 9: Odysseus
Chapter 10: Cordis Die
Chapter 11: Judgment Day
Thank you!
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