For this achievement, you need to use 3 Super Attacks, and switch character between each one. The actions needed for each Super Attack is shown on-screen.
Theoretically it can work between any two characters, but some Super Attack flow together better than others.
Start a Versus Mode match and pick whichever two characters you feel most comfortable with. For my example, I will use Thor and Hulk. Your opponents will just be dummy characters, so it doesn't matter who you pick.
When the match starts, use Thor's first Super Attack, then switch character by raising your left arm. Now use Hulk's second Super Attack, and switch character again. Now finish off with Thor's third Super Attack.Please either comment below or send me a Personal Message if you have any comments or improvements.