Here is the full list of all 20 On the Wings - there are Birth of a Hero achievements.
Grab a weapon and shield in the game.
Save a Dragon and earn his friendship.
Fly with Dragon at least 5 minutes.
Collect 1000 Gold.
Collect 10000 Gold.
Kill 100 Pig in the Game.
Kill 100 Guardian in the Game.
Have Silver Wise Dragon.
Have Golden Wing Dragon.
Have Dark Night Dragon.
Destroy all Castle Guards.
Destroy 3 Catapults.
Hunt Grizzly Fire Bear.
Ride Red Breath Dragon.
Win street game against kids.
Kill 20 Monsters.
Kill 10 Monsters.
Burn and Destroy 5 Ships.
Ride Forest Snake Dragon.
Ride Thunder Cloud Dragon.