I'd like to hack some achievements for a few games that I no longer own. I have Le Fluffie and Modio (I would have Horizon, but the creators of it recently made it only accessible in all its glory to VIP members of Se7ensins and only offer a watered down version to everybody else). All of my previous attempts have been met with one of two results: my 360 would read my profile as corrupt, or it would show my gamer score as I hacked it but say that my saves can no longer be used to unlock achievements (says the saves belong to a different profile, and so I can't use them for achievements).
I think the problem is that I'm just missing something here. I'm sure whatever it is is obvious, but I still haven't figured it out. My ultimate goal is to hack a few achievements while still being able to read my game saves as my own. Is this possible? And if so, how do I go about doing it?