Bakugan: Defenders of the Core

This is at the end of the fourth level. The first in UK.
The game will guide you through building a hologram tower. Just select the tower that is strong against the enemy power. For me the enemy power was a star and the 3rd tower was strong against this, so I used this one. You'll need 300 of the currency, but that shouldn't be a big problem.

Achievement unlocks as soon as you start the fight.