Bangai-O HD Missile Fury

Very easy on Level 1. Simply get 5/10 energy bars and you will be able to use your invincibility max attack but don't do it just yet. Finish off all of the blue boxes around the edges of the map and four bigger enemies will spawn. Damage them a little bit (but be careful not to kill all of them yet). Then press the X button. While in this invincibility mode, you will be doing MAX attacks so quickly finish off these enemies while you still have the blue bars showing on the top left of the screen. You will then get the achievement as you complete the stage.