QUOTE(sabbath_dude @ Sep 28 2011, 09:31 PM)
That's not true. Homebrew achievements are not recognised by Microsoft since they technically don't exist. It doesn't matter if you unlock them with your regular account. I use the same account for all my JTAG activity as I do on my unmodified Live console. I've done this since the very beginning and never had a problem. Same goes for homebrew and games etc. Just about everything is stored on the same 120GB HDD which I switch between consoles. It's not any different to the Xbox 1 days.
Basically I was saying that it should be safe. as far as achievements I was only guessing that it might not be safe really to have achievements not recognized by Microsoft if you are wanting to be safe. I know they wont ban the console though for profile mishaps.