Here's an excellent interactive map with all the objectives marked so you don't have to run around like an asshole looking for some dead body in a hidden alley somewhere anymore.
GZW Interactive Map - Loot Maps, LZ's, Key Spawns, Container Spawns & Enemies mapped out!
mapgenie.io
Also does anyone know what the deal is with the Gunny quest Medical Detective? The description says I should find a key on someone I killed but is this generated randomly? I've killed 20+ people and no one has this key and it's starting to piss me off.