Yars: Recharged

This can be very easily done on the first level of Arcade mode. Just load it up and, you should have three towers and a core. The tower protecting the core will also have a lot of walls on it's side. First, attack one of the "short" towers from above, collect it's power-up, then fire at the "long" tower from above or below to quickly penetrate it's defenses. Close in so you hit all your shots, or nibble at it to collect the energy, and head back to the Zorlon Cannon, which should get loaded right now. Fire at the core and the achievement is yours.