This one is for the Neurax Worm level. However, there are two ways to win in this level:
Eradicating - Follow this guide
Enslaving (Which is for this trophy)
This can be done on any difficulty, but for this guide, this was played on Normal difficulty.
I started in South Africa for this level.
Edit (Forgot to add that segment): Wait until you earn 25 DNA points and spend it on Concertina Locomotion, Undulatory Locomotion, Air 1, Water 1.
Wait again until you earn 25 DNA points and spend on Cold Resistance 1, Trojan Planes, Drug Resistance 1.
As for The trojan planes ability (There will be in orange and plane icon and drag to the designated country), prioritize on infecting the islands first, I infected both Greenland and Iceland especially. By that point, you'll have to be on your toes as by that point, the infection will become spotted around that point.
Continue infecting islands with the ability when available and continue to build your DNA up to 35 Points and spend on the transmissions Water 2, Air 2.
Afterward, continue infecting smaller islands with the Trojan Plane when popped up, for this case I infected The Caribbeans and Philippines.
At this process, build your DNA points up to 125, then spend it on:
Air 3, Eggs 1, Eggs 2, Water 3, Eggs 3, Drug Resistance 2, Cold Resistance 2 and Genetic Hardening 1.
Once spent, we'll need to start infecting faster, so build your DNA up to 100. Spend on these infections: Genetic Hardening 2/Neural Breach, Cerebral Tendrils, Frontal Mesh, Immaturity, Mania.
Now, this is the point where we steer towards Enslaving trophy, for this case wait until the entire world is infected and then evolve on only these: Obsession, Devotion, and Transcendence.
By doing this, you'll automatically win as the entire world will be enslaved by your infection and the trophy should be yours.
Notes:
I had 70% cure completion by following this guide, but shouldn't pose a threat if your infection bar is partially at its max. Should you need to reduce the cure rate speed, spend on them if in doubt.
Remember to pause or slow down the game speed when you reach the DNA points suggested and save often should anything backfire!
Don't branch out anything that's lethal, this will jeopardize this trophy and you'll most likely to eradicate the world.
Anything else that you like to comment regarding this guide, please don't hesitate.