How to perform the glitch:
1)Sign in to your SOURCE profile on controller 1. - Source = the one with the achievements on (are you stupid?)
DONT SIGN IN ON CONTROLLER 2
2)Start the game up.
It really depends on what game you are performing the glitch on as they vary.
3)Press the guide button on controller 2.
4)Press the X on controller 2.
5)Highlight Your Destination profile and press A on CONTROL 2 and press X on CONTROL 1 at the same time
keep pressing XAXAXAXA on Control 1 until the sign in process is done. It will look as if you never signed in but you destination with be signed in on CONTROL 1