Shiness: The Lightning Kingdom

You will unlock Hyper attacks as part of the story. After that, you can initiate them during battle with  if your hyper meter is filled enough (it will fill each time you are hit or hit the enemy) and then you'll need to do a quick QTE and press the proper buttons to execute the combo. Use this on a weak plant creature to unlock this achievement quickly. You'll likely do this often though as these do a lot of damage, especially if you prefer physical combat over magical.