I struggled with getting this ach and I finally found something that worked for me on both the 360 and the One.
First, make sure you have unlocked, purchased, and set Booby Trap in your active loadout.
This ach did not pop in a private match, so then go to a public match.
I found that the relic matches worked best. Find a lift closest to the relic you are defending and booby trap it. Stay in the white area, defend, hide, whatever, as if you die your trap will disappear. If you get stunned while defending, your trap will remain active. Once the trap is active, you can watch your cooldown and place another if you like.
On the 360 it took 2 matches before someone used it and on the One it took 4.