Injustice: Gods Among Us – Perfect Aim Trophy / Achievement Guide
This works best in Multiplayer Versus Mode. This is a local multiplayer mode (not online). If you have a 2nd controller, make use of it. If not, then you need to reassign the controller after selecting Deathstroke to choose a fighter for “player #2”. Of course, in this case there is no real player 2. You are just doing this so that the other character will be standing still and you cannot miss a shot. In a real match it would be rather tricky not to miss a single shot.
So play as Deathstroke and use the following combo at least 12 times:
Xbox 360: ↓,→,Y