This is a multiplayer achievement and can only be done in ranked matches.
In Bond Versus mode, one person plays as Bond and 6 other people play as the Organization against Bond. There are three bombs on the map. When you are playing as Bond, run up to a bomb, make sure no one is around you, and hold X to diffuse it. You are playing by yourself so make sure no one is around you before you start diffusing the bomb because no one will defend you. You have two chances to diffuse a bomb because you have two lives.