You should end up getting this achievement naturally when you try to go for the 'Chaos' achievements. Traps can only be used during the Chaos Squad segments, when swarms of enemies attempt to swarm you at once. You are given a set amount of energy to use, which allows you to place one of four traps around the area. You can unlock several more traps throughout the game.
However, I personally prefer more traps over better traps. It uses less energy and lets you spread your traps out more. Gun turrets and blade traps are the most useful. Put these right outside the fences that block the way to your Overcharge tanks. The enemies will swarm them and get gunned down, or knifed to bits.
Try to use up all your energy you can, don't let it go to waste. If you have 30 left, use a trap that needs 30 energy, not one that needs 25.