Raskulls

For this achievement you need to launch a total of 10 opponent Raskulls into the air using the Thunder Staff. The Thunder Staff is one of the most common pick ups and you shouldn't have much trouble getting one.

You can unlock this achievement while playing a local co-op game so long as you have extra controllers. I choose to play it in a 4 player game and use my primary controller to advance through the level until I picked up a Thunder Staff. Once you've got one use your other controllers to run to your Raskull and then jump onto his head.

Now, once all your other controllers are ready and stacked up on you you need to hold the "LS" up and then press "Y". This will cause the other Raskulls to be launched upward. Repeat this process until the achievement unlocks!

Note: It appears the game has been patched and you can get this achievement across multiple games now. However, if you do seem to have trouble unlocking it, try doing it in a single game!

I've linked in a video below which demonstrates this method using 2 controllers.

* ^{Credit to aaronthesplazer for the video}