Try here, I think there is one for this that's on 99% out side a store that you rob to get 100%. http://www.xpgamesaves.com/topic/83433-gta-5-mega-save-thread-need-a-save-then-find-it-here/
tbh that wouldnt help, i got the 70 medals achievement but i also have the 100% one to so when someone views my stats it would say that i have completed the game 100% but dont have 70 medals which can lead to a banned