Here is the full list of all 17 SKYE achievements. It takes around 1-2 hours to unlock all of the achievements on Windows.
Fly a distance of 20 kilometers! Don't worry, the plane runs on renewable energy
It's an entirely different kind of flying! Completed your first race!
Saved Samuel from his embarrassment and his shame.
Ran errands for Norman for the first time.
Landed the plane and docked it at the village for the first time!
Established communication with your old friend Samuel for the first time.
Punch the throttle and take flight for the first time!
Listened to Elizabeth's war stories for the first time.
Ran all the errands for Norman and now he owes you instead.
Satisfied a trigger happy lady's lust for gunfire and target practice.
Found all the random spyglasses people lost over the years.
Took Samuel's amusement away by shooting all the targets out of the sky!
Achieve a bronze rank or higher in both races. That's something already.
Achieve a silver rank or higher in both races. That's pretty good!
Achieve a gold rank in both races. Your flight skills are excellent!
Helped out every villager and completed every quest! Remember to bill them next time.
Completed all other achievements in the game! You can retire now.