Dragon Ball: Raging Blast 2

This achievement had me confused at first. What you want to do is go through all of the battle zones, and equip the power down items that it tells you to use. Each stage will have a different list of stamp requirements. All of the battle zones are easy, which is why I recommend you do all of them. When you're finished with that, you will have around 210 stamps, give or take.

Then, what I did was went through the easier Ultimate zones for the remaining 90. At first, I didn't try for stamps, as I was just trying to pass each level. Then, I went back and got the remaining stamps that were easier like Supers Unused or Defense Power Down.

Basically, just do all the battle zones, and do your best with the Ultimates. Good luck guys, and remember to switch your character after every stage, to get different titles. :D