There's really only 2 things to get stuck on and that's where I got stuck myself.
The first tutorial is completed by doing what they say.
The second is the Guage Tutorial and that's where things get a little wierd.
For the first Max Cancel you have to input the first move and then hammer the "B" button instead of trying to input the 2nd move. Why? I can't explain but it works.
For the Second Cancel you need to be in HD mode.
To do this you need to press HP and LK (Y & A) at the same time.
This seems awkward but is easily done by simply pressing all 4 buttons at the same time (X, Y, A, B). Just put your thumb in the middle of all of them and press down.
Once your character is in HD mode complete the first move and then quickly do the 2nd. It won't be too long before you get the Cancel and the achievement will unlock for you.
This game is playable with the 360 controller but I recommend the 360 Fight Pad. Just a little easier to input moves with the larger D Pad.
Hope that's helpful to some people.