Start a game of Shadow Plague on casual with the Brawler and Budget Bat genes. These remove the DNA cost for travel and murder.
Start anywhere except the UK, then evolve:
Put a lair down wherever, then immediately start flying around the world. After about a month in game, evolve Shadow Blessing; this storyline is a bit trickier than the others, so you'll need to get the drop on it sooner rather than later. Infect countries for now, but don't evolve anything.
After a while (it took about four months in-game for me) you may get a newsreel about tourists toppling the Standing Stone at Stonehenge. If you get the historian's map or the cavers, restart the game. Assuming all went well, make a save here. Start evolving symptoms and transmissions:
The first actual popup regarding Stonehenge is the mutated skeleton. Once your disease is discovered, about three months later, it will elaborate that the skeleton is infected with your disease. Save here to have a closer starting point for Power Overwhelming. Evolve Extreme Bioaerosol to infect the Stonehenge team, popping the achievement.