Fully upgrade a Super Ability
Super Abilities are chosen after you choose which Ninja you want to play as when entering Multiplayer.
To fully upgrade you will need to continue to play with a single ability. This trophy should come naturally while ranking up for Atomic Ninja . I was able to upgrade 2 different abilities whilst boosting, but I can easily see how others whom I was boosting with were able to fully upgrade 3+ abilities. Abilities should take roughly 10-15 matches to fully upgrade.