Reflect 20 bombs using your shield in a single match
These are quite tricky to reflect if you are doing this alone. This is best done with a second controller and if you can, with a second person to use that controller. Have one player stay down low and the other player fly above at the top of the level. Hold down Square to drop a load of bombs at once. If you then boost through this you might reflect a couple of them. You know you have reflected it because you will not take damage and will see the bombs bounce away.