This trophy is for using the Burst Attack (equivalent Ultimate Jutsu) in a mob battle.
During mob battles, while you're hacking away at your enemies, there is an on-screen Burst gauge that slowly increases with every kill. Once the gauge is full press Y,Y, then B to initiate the attack. And for cinematic, once the attack makes contact a button command will appear. Quickly input the correct button command and watch as you seamlessly execute your foe in rapid succession.