Fly Very far from Earth - You'll be doing flying for about ten to twenty minutes until you get the achievement. You'll know its working if you keep flying for approximately 5 minutes, and by then you get some hints about returning. Eventually it will say that you will not get a trophy for it (but you do). Once you get the achievement, you should fly back. We tested going further for about thirty minutes, then spent the next two hours trying to find a black hole so we could respawn. Head back as soon as you get the achievement for your own time sake.