do all moon flow missions and don't go to mt gagazat during chapter 3 = key to success!!

Don't do any moon flow missions at all and, during chapter 3 or chapter 4 tobli will be in a hallway. Puch him in the elevator to get a cool accessory. I think it breaks hp limit,

To get 100% completion is easy you don't even have to do everything in the game. But you do have to talk to that old man a lot to get the perfect ending. lol