Competitive General RAAM This achievement is currently glitched and is seems as though it will unlock along with the 80 fight challenges achievement. Dev's must have coded the achievements incorrectly on accident to 80 challenges titles. I am sure this will be patched in the near future.
Confirmed by 3 people who already unlocked it.
(For when this achievement is fixed):
You might have to mess around with this a bit but my technique did not involve using shadow moves or much combo's really. I am not that great with Killer Instinct but when I started using

for every attack it seemed much easier.
Using the Heavy attack with RAAM makes it to where you do not have to have a finisher at the end of combos to deal the maximum amount of damage, it also has the maximum amount of range so use that to an advantage by keeping a good amount of distance from your opponent if possible. I would also jump a ton, and if your opponent starts jumping use the heavy anti-air attack by pushing

and

.
If your opponent starts smacking you make sure to to rotate your right analog stick unless you know how to combo-break without it. Also make sure to use Instinct mode when you get it, which if your RAAM is all black your opponent will have difficulty seeing you.
I have won over half my battles and obtained 15 wins in 1-2 hours. Good luck and have fun!