DRAGON BALL: Sparking! ZERO

This side path is unlocked in Future Trunks saga in the "Trunk's Choice" episode.
You will need to be on normal difficulty to unlock the branching path. Choose "stay here and train". You will then need to beat Vegeta, Piccolo, and Gohan within a certain time limit. Then choose to go with Vegeta.

Try to get to sparking mode as fast as you can. In sparking mode get in close(dragon dash with RT+A) and spam X, then eventually press Y and immediately use you're Ultimate attack (RT+B).

For any following episodes on this branching path you can change to the lower difficulty and still unlock the achievment. Work with your Dad to win the Tournament of Power for Universe 7 and you will get the achievement after the final episode in this path.