I got this achievement when I had 100 revives, 250 ammo packs given, and only 100 COMBINED field ops and medic stars (i.e. 50 stars with Medic and 50 stars with Field-Ops) and a friend of mine confirmed this as well. Also, the revives only count if you revive someone that is not a medic, and the ammo packs only count if you give them to someone that is not a field ops.