You should use Type 3 and try this on the 2nd mid-boss. Place your option on top of the boss, hold down the auto-fire button, and tap the laser button to produce lots of energy items fast. You will notice if you hit 72 pieces when your option can't hold any more energy in place and they start to leave the screen. Now, just graze the mid-boss' bullets. His patterns should be dense enough to make the energy items grow to maximum size before they disappear.
Jakez123 Credits: Helg0r for this achievement description.