Here's a save I just made where the regular game is already beaten and the Black Suit playthrough is at the very beginning. That is, you can play through every mission of the game with just the Black Suit and never the Red. I also have Maximum Swing Speed unlocked as well as the Super Health Upgrade. It will probably unlock a lot of achievements, but I don't know which ones. Download: http://www.mediafire.com/?hka3rqr47ffmaof