Breakers Collection Perfect Run Achievement 

There is a pretty easy method to get this done. Here are the steps :
1. Play Breakers revenge
2. Set difficulty to 1(Easiest)
3. Make sure you have 2 controllers connected.
Once you start the game and are on character select do the following :
Move both Player 1 and Player 2 let thumbsticks in a circular motion (for Player 1 it's counter clockwise and for Player 2 it's clockwise). Keep spinning the controller left stick in the direcitons listed on both controllers and you will see a new character that you are able to select : Bai-Hu (The final boss of the game)
You can also push UP (Must be D-pad and not thumbsticks) on both controllers to be able to select Bai-Hu. (Thanks to Neostraycat)
Select him as your character. Now all you have to do is hold away from your opponent and push RB (Right Bumper).
Time it that whenever your opponent gets up you push back and Right Bumper.
So you are always blocking and doing the special move. You dont need any other moves.