sorry if this is the wrong section if so please move it, what is a spg game save? what is the terminology for spg?
SPG = Second Profile Glitch, I don't think these work anymore, you would sign in as the profile with the achievements and at a certain point sign in with the profile you wanted the achievements on and it would unlock them, for example gears of war 1 you did the SPG and it transferred all stats so you would play one game online and unlock a bunch of achievements.
Legit achievement order so it will look 100% legit if done in the correct order. Also, SPG still works fine on some games still for instance Rainbow Six Vegas 1.