This is probably the toughest scenario to date so it might take a few/lot of attempts before the RNG is in your favor! You need to score 65,000 points and infecting the 5 problematic islands quick enough to get 3 biohazards is a big challenge even on casual!
Play the Mad Cow disease official scenario and choose the following genes; ATP Boost, Genetic Mimic, Native Biome, Extremophile & Sympto-Stasis.
Play on Casual difficulty and start in Saudi Arabia.
Evolve Heat Resistance 1 (Abilities)
Evolve Hermetic Storage Resilience, Frozen Storage Resilience & Preservative Storage Resilience (Transmissions)
Evolve Human Cross-Infection (Abilities)
Evolve Coughing, Pulmonary Oedema & Coma (Symptoms)
Evolve Cold Resistance 1 (Abilities)
Evolve Mania, Delirium, Insanity, Cannibalism, Systemic Infection, Necrosis & Total Organ Failure (Symptoms)
Evolve Cold Resistance 2 & Genetic Hardening 1 (Abilities)
Evolve Ataxia, Blindness & Paralysis (Symptoms)
Evolve Fish, Pork & Lamb (Transmissions)
Evolve Acute Encephalitis, Abscesses, Pneumonia, Hallucinations, Seizures & Inflammation (Symptoms)
Evolve Plant Dissemination (Abilities)
Evolve Potato & Avocado (Transmissions)
Evolve Genetic Reshuffle 1-3 (Abilities)
On casual if you only have 1 country left to be infected and it closes its port the game will normally create an event to infect the country which can help.
Hopefully it doesn't take too many attempts before you unlock it!