Dragon Ball: Raging Blast 2

Lone Warrior - "Using Android #17 and Android #18, win against Super Saiyan Future Gohan with Team Super Attack."

Go into battle mode and set up a 1PvsCPU (team) battle, select Android 17 and 18 for yourself and Super Saiyan Future Gohan for the opposition, get him down to about 1 bar of health as you need him down to that to use the Team Attack, charge up full ki, and use 18's "Sadistic 18" ultimate attack and the team attack will be used instead of the normal ultimate, your achievement should pop right after the match.

For this achievement a second controller can be used, select battle then select team battle, then just put 17 and 18 on one team, and put Super Saiyan Future Gohan on the the other team on his own, start the battle and defeat him with the team ultimate attack which is done by getting his health down a little past one bar and then launching the ultimate attack and pressing the right button combination that show's above 18's health gauge.

I say 18 as that's who i used and the button combination for me was +, might be different for others.

Just as RuukuSukotto says, you have to use Android 17 and 18 and win against Super Saiyan Futrue Gohan with their Team Super Attack. Tho you can also get this achievement in 1P vs. 2P and let the second player just stand there. As your about to do the Team attack tho, you'll have to hold the right trigger and press X to activate the team attack. Then pop theres your achievement.

Here's a video guide of all the Team Super attacks. While only the one for beating Future Gohan is required, the others are all pretty cool to do.

If you want to skip to the Android #17 & #18 team super, go to 02:41 in the video.