Tekken Tag Tournament 2: Prologue

A Tag Assault is performed by pressing after a bound attack, a bright circle will flash as your tag partner comes in for a brief moment to extend your combo. An easy way of doing this would be to go into your options and mapping one of your buttons to LP+RP+TAG (++) in the Controller Setup menu, using it will cause an automatic Tag Assault for you, perform it 5 times for your trophy.