[Tohopekaliga]

I figure you kinda HAVE to go through several iterations of New Game + in order to get some accomplishments (like max level).

I did all the boss secret missions. I think I did about half without even thinking about it when I first played, but I played again and specifically did every secret mission. Some of them are really hard to pull off (tiny window of opportunity)...The hardest that I recall were Schwann and Yeager...I think it was basically the same secret mission for both of them, and you only had a couple seconds to do it, during a time when usually all your characters got knocked down.