Skyward Sightseer
Ultra rare0.1%GrindOptional
Visit 7 landmarks by hot-air balloon. Stay within 1 km for 3 minutes at each landmark you visit
This can be done in Free Flight in one or two flights by picking locations that are dense with landmarks; e.g. Paris, London or New York. Set a landmark as your departure position to start in the air and pretty close to the first one.
It helps to have the Xbox achievement tracker (or Game Bar; Win+G on PC) open so you can see more quickly when the progress ticks up and when its time to move on to the next landmark.