There are a total of 24 Super Moves in Injustice: Gods Among Us. Each character has one unique super move. These moves act as finishers and deal a lot of damage. Wonder Woman has the strongest super move (41% damage) and Harley Quinn the weakest (27% damage).
Performing every super move will earn you the “Superhuman!” trophy / achievement. The quickest way to do this is Practice Mode. When the Practice Match starts, press the Start-Button, go to Practice Options and set the Super Meter to “full”. Perform one Super Move and go back to player select. Here you can choose the next fighter and do the next Super Move right away.
To trigger the moves your Super Meter has to be full and you need to press L2+R2 (PS3) / LT+RT (X360).
ALL SUPER MOVES VIDEO