Every character in 'Mortal Kombat 11' has a secret 'fatality' — here's how you can execute all of the game's brutal finishing moves

You don't need to unlock all the hidden fatalities in "Mortal Kombat 11" before you can use them. You just need to know the right buttons to push.
Polygon

All Mortal Kombat 11 Fatalities and how to perform them

To do a Fatality in Mortal Kombat 1, when you drain your enemy’s health to zero for the second time in a match, a message that says “FINISH HIM/HER” will appear on screen; this is your not-so-subtle ...