Rubberneck
Very rare4.6%ObjectiveOptional
Use the Smart Cam to view a star landmark for 3 seconds, from a distance of 550 yards or less.
In free flight planning, before starting, zooming in on cities and famous locations you can see landmarks - some of which are starred; e.g. Big Ben in London.
When flying, fly over slowly, use the external camera and enable smartcam -> the camera will pan to focus on the landmarks automatically.
NB this achievement may not visually pop in the UI, so check your Xbox profile afterwards to see.