Ben 10 Omniverse

This is probably the first achievement you will get. As soon as you start the game there will be enemies appearing. Just stay as Ben and tap X to use your light attack, if they are close enough together you can get this but unlike the others it can take a bit of luck depending on how often your AI partner hits your enemies.

(You could always stick in a second pad and have the seond Rook just sit there if you struggle)