Oh Yeah!G 10

You obviously need to unlock the operator named "Thermite" under attackers. Once unlocked, play MP (social OR ranked) and find a reinforced wall (metal walls that players put up to fortify a room). Once you find one, walk up to it and hit RB. It will place a charge on the wall just like a breach charge. Hit RB again and the charge will cut through the reinforced wall, immediately popping the achievement.