well the socom platinum wasn't a hack. When I found it, I was copying over my main save file over to my other names so I could get my gun load outs and custom character. Then I accidentally got a trophy on the new name but it said, "You have not earned a trophy" or whatever. Then I looked at the trophy progress and all of my main accounts trophy progress was on my new account. Eventually figured out if i started socom without a save the game would issue me the trophies it was trying to give me.

Long story short, I found it by accident. It's kinda weird to say this but most people that got the original glitch platinum of 83%, came from my main accounts trophy progress.

Not every game is exactly like this. Modern warfare 2 for example was hex edited to give all of the spec ops trophies which ended up making the game think you beat the single player on the hardest setting.