Two hundred Targets

This will take a lot of grinding - even if you're repeatedly grinding the missions in each campaign segment to earn the cash for plane upgrades. Note that you can bomb any random enemy buildings to count against this - even the optional photo op recon objectives (if you're nimble you can get a photo and bomb it in one pass over!). If you bomb on a first pass and photo the wreckage on the 2nd pass you *will* still get the recon photo credit. Do this on every mission to help get there more quickly...