(Note:This has only been tried with a big boss charater. This has not been attempted with any other character.)
To Unlock a character's ending (Without going through all the rising difficulty) Pick a Big Boss character (Onaga,Goro,Blaze,etc.). Once you have selected your Charcter, You must defeat at least 14 People(Which should be easy because you gain health every 3 deafeted opponnents). After you have, you will rejuvenate health. After your health rises the screen will go black. You will then have to fight Blaze. After you have deafeted Blaze, an endiing will appear.
Here are some fatalities for Mortal Kombat Armageddon
upper half circle to the left,, upper half circle to the left, straight line going left, straight line going to the right then to the left,straight line goingh to the right then to the left,wii remote straight up
Fatality name~stinger: moves: arm break,arm break, punch,kick,kick,head rip __________________________________________________________________________
Upper half circle to the left,straight line going left,upper half circle to the left,straight line going to the right then to the left,straight line going to the right to the left,lowerhalf circle towards the right,poke the wii rermote up
Fatality name~the tummy tuck:moves: arm breeak,punch,arm break,kick,kick,kick2,torso rip _____________________________________________________________________________
I will be posting more fatalities later I hope these help.