If you don't get this naturally through playing the game, you can grind this out fairly quickly in the first stage of the game, Feed the Fantasy.
The second fight of this level introduces blocking enemies, with a single blocking enemy spawning, ready for you to smash through their block. Simply hold
to charge the attack, and release to break the block.
Once the enemy is stunned, you can simply reload the checkpoint from the pause menu. Rinse and repeat for however many more you need for this achievement.
I'd recommend turning tutorials off if you still have them enabled, to speed up the process slightly.