You can get this in any game mode but the easiest way will be using 2 control pads...
First off make sure the
minimum number of rounds you select is 2, now with player1 choose the character
Kotal Kahn with Blood God as your variation and anyone else as an opponent. Now with player2 beat Kotal Kahn to near death then swap controllers, now perform Kotal Kahns Blood Offering move (facing right)
until he kills himself. Now simply use Kotal Kahn to win the remainder of the fight and the trophy will pop...
Hope this helps...