SOULCALIBUR VI

1/ Grab 2 controllers and go to Versus mode.
2/ Kill your standing opponent 15 times (avoid ring-outs).
3/ Enjoy 15G.

Select 'Battle' then 'Versus' with the following settings:

Player: Player vs CPU
Round Count: 5
Battle Time: 45
CPU Difficulty: Easy
Battle Mode: Standard
Pause Menu: Standard

Select Raphael for yourself and anybody as the opponent. In the match hold Right on the D-Pad and press Y, Y, Y to perform a combo and keep doing this until you win.

After you win select Rematch and repeat the process 3 or 4 more times to unlock the achievement.

This can also be done against a second controller but on Easy this is still very simple to complete.