There are several legit ways to get "Fly Like an Eagle" achievement. The easiest method is to build a Ferris wheel and ride it (as a downside - you need to own the Party Time DLC). Alternatively, you can take off with the car by sweeping its roof, but it does require a lot of time, effort and luck.



But one more way exists that does not require any additional content or the whole evening spent on trying... You can ride a UFO!

Before you ride a flying saucer, you need to find it, right?

It lays near the gas station in a small canyon. To get there, first exit through the main door and immediately turn right.



You need to get to the very corner of the workshop (from here you can already see some stones).



Walk towards these large orange/brown/red stones.



Pass into the crevice between the stones (aka so-called canyon).



Move forward and you will see a flying saucer (as well as a card as a bonus for your efforts).



Now jump on the UFO and adjust yourself almost to the center.



Press left-click to pick the flying saucer up with you. Keep pressing till your screen starts turning red as if something bad is going to happen.



And voila! Achievement is yours!

If you have any questions regarding the process please feel free to leave a comment below. Although I doubt that questions may arise, everything seems to be clear enough.

Also don't forget to thank me in any way if the guide was helpful to you.
See ya!