Spicy's Comment: Have not browsed through achievements for Simian Flu yet, so thanks Ariel Aguayo for submitting a guide for one of its achievements!
Not Just a Pretty Face Achievement Guide by Ariel Aguayo
This achievement is actually not very hard at all. I got it on my first try with no trouble, as the cure wasn't even close.
Pick Viral Affinity and Latent Catalyst if you have them.(These are genes, just to clear that up.)
The country to start in doesn't matter too much, but China or USA should be good. To get this achievement, evolve Simian Neuro-genesis first, then all the transmissions with a green background(Ape transmissions), starting with Homindae Bridge. Next begin evolving all the ape travel abilities so that you may move your apes to get every ape in other countries, as well as some combat abilities to destroy any labs that come up so that cure research doesn't become a problem.
You can use travel to hop from Asia to the islands in the Pacific, from Europe to Greenland to the Americas, etc. Set the view to the ape population since you're not worried about human infections (though you will end up spreading to every country anyway). The goal is to be able to tap on any country's info and have the first number (uninfected apes) equal zero. With all the ape transmissions, countries' apes will be fully infected almost immediately! Once every country has zero uninfected apes, the achievement is yours!
