This achievement you may easily get while chasing some of the other score based achievements.
However, just in case you do not. The trick to getting this achievement is to save up AT LEAST two bars of turbo; more make it easier. Then simply pick a character (one of the nicktoons ones that are easily identifiable by sight I recommend) and hit a turbo homerun with him/her.
Then wait for them to cycle through to bat again and use your other turbo to hit a turbo homerun.