Another trophy that sounds hard on paper, but in reality, is actually very easy to do. Kill eight enemies within two seconds to earn this trophy.
As with the other “kill x enemies with a specific weapon” trophies, this is best done on the smaller, weaker enemies of the game. You will most likely unlock this trophy naturally, with next to no effort when you play through the game. Note that enemies killed by your partner(s) count towards the two seconds. Why the developers bothered to include such an easy trophy in this game, that I do not know.
Recommended weapons are ones that create big explosions, such as the Plasmabomb Launcher or the Warmonger.