This achievement is very straight forward, but here are a couple of useful tips.
-I find that the Lightning Diabolical pitch is the most useful.
-In order to use a Diabolical pitch, you must knock down a certain number of dolls. You will know when it is ready, as a message will display in the middle of the screen. Follow the on scree prompts to activate the pitch.
-There is a powerup card that you can acquire (after reaching certain progress through the game) that limits the number of kills before you can use a diabolical pitch. This makes your progress go faster.
-Although you will probably get this achievement through normal play, you can keep playing Space World - Extra Stage. You will get several Diabolical pitch opportunities, plus it is a good boosting area for coins.
-Another boosting area is in Garden World. These stages have "Hell Traps". This area is good for using charging up and using Diabolical pitches. There is no limit to how many times you can fall into Hell, as long as you don't kill the enemies that pull the switch.