Rest in pieces: Achievement PSN of Ruiner

You can get this trophy in rooms with lots of explosive barrels, the key is to lure 3 toward you (do this by dashing around them in circles to bring them closer together) and shooting a barrel that is either beside them or behind them (barrels tend to pull toward you when you shoot them) you can almost melee a barrel into them to get this trophy. It may take a few tries and a bit of luck to obtain.