Being this is a new one for PS4, I'll list them out in order of easiness
Bacteria
Virus
Prion
Neurax Wurm
Bio weapon
Nano-virus
Fungus
Shadow Plague *
Simian Flu
Necroa Virus
*DLC trophy tied in, may also not be needed as I did this before simiab and Necroa. But worthwhile doing it beforehand to get rid of all difficulty trophies as quickly as possible.