There are two saves one for the start and the other for the complete.
The goal of these two saves is to have everything unlocked while being fair play.
For Rockstar Games Launcher C:\Users\%USERNAME%\Documents\Rockstar Games\GTA V\Profiles
The location for your saved game folder depends on your version of Windows.
Where are saved games located?.
GTA 5 save games can be found here:
C:\Users\%USERNAME%\Documents\Rockstar Games\GTA V\Profiles