Here is the full list of all 33 Impossible Soaring achievements.
Fly through a cloud.
Fly through a windmill.
Beat a level with a score of at least 50,000 points.
Beat a level with a score of at least 100,000 points.
Buy a perk from the merchant in town.
Cought a total of 1000 fish.
Popped a total of 500 balloons.
Completed a 25,000 point streak,
Completed a 50,000 point streak.
Completed a streak with a x3.0 combo multiplier.
Completed a streak with a x4.0 combo multiplier.
Flew extreamly fast.
Reached an altitude of 1km.
Reached an altitude of 1.5km.
Flown a total distance of 1000km.
Accumulated a total of one hour of flight time.
Busted 10 clouds.
Vanquished 10 windmills.
Gained 500,000 total points.
Gained 1,000,000 total points.
Achieved a Flight Rating of 50.
Achieved a Flight Rating of 100.
Achieved a Flight Rating of 150.
Beat City of Towers with an S rank.
Beat Shelf Canyon with an S rank.
Beat Sunken City with an S rank.
Beat Mountains with an S rank.
Beat Stone Ruins with an S rank.
Beat Coral Atoll with an S rank.
Beat Sky Stacks with an S rank.
Beat Jungle with an S rank.
Beat Sea Platforms with an S rank.
Survived a level while taking no damage at all.