How do I prevent Brexit?

Solution 1:

Using the guide found here, it seems the best way to get the achievement is to take it in two steps:

Step One:

• Start in China
• Devolve any mutated traits that occur
• Wait for the pop up for the Brexit event. It is title "UK votes for Brexit in referendum"
• Though not necessary, save your game at this point. You may use this save to go back and get other Brexit related achievements.

Step Two:

• At this point, your disease should be spreading. Wait until the UK gets infected with it.
• Once the UK is infected, evolve the following:
  • Insomnia
  • Paranoia
  • Cysts
  • Hyper Sensitivity
  • Cold Resistance 1
• After the UK gets infected, wait for a pop that looks like "XXX triggers Hard Brexit"

This will get you the Hard Brexit achievement. However, if the UK gets completely infected before the "XXX triggers Hard Brexit" message, the Brexit will most likely be cancelled, which should unlock the other achievement "No Brexit." Remember, if you mess up or something else goes wrong, you can reload your save.

TL:DR:

basically wait for brexit referendum, get uk infected, upgrade those symptoms, get uk fully infected asap