On GTA V, two of the three endings requires you to kill someone important.
There is the ending A called Something Sensible that makes you
Kill Trevor after chasing him to Murrieta Oil Field in El Burro Heights
And also the ending B called The Time's Come where you have to
Kill Michael after chasing him to Palmer-Taylor Power Station in Senora Way
Is possible to get the 100% of the game by choosing one of this endings? (maybe by completing all of the character-specific missions after The Big Score and prior to the ending)
Best Answer
According to the wiki:
spoilers
answer(possible spoilers)