During the campaign mission Avanti Savoia, just after the first objective You'll be able to pick up some dynamite from a crate. and the A.I will attack with a couple of trucks and a few soldiers. This is the perfect time to get all five kills with one stick. Simply run in and throw one set of dynamite (
) next to the truck and run away and detonate the dynamite (
). and watch the truck explode killing 5 or even more enemies to get the trophy.