There is nothing official written up from Tom or from any of the players that I know of. That said 6 months ago or so, Tom shared some history of titles in his fed that he has been keeping record for the last 20 years or so.
I'm not sure what are of the game you are currently playing, but if its the current era then you can just assume that any of the legends like Star Warrior is at least a 10 time Galaxian Champion.
I can't find it now, but I remember reading it somewhere on the boards. It was more a statistics from his personal fed than something official, like who held the Galaxian champion the most and those who followed it up.