You Just Activated My Trap Card! achievement in Override: Mech City Brawl

This can be boosted with a friend. Select Vidar, have your friend or second account stand still while you build up 3 bars worth of special move. Stand a little away from your opponent and drop a trap by holding and pressing . Have your friend or second controller run over the trap and wait a few seconds for it to wear off. Repeat 2 more times.