Here is the full list of all 24 Skyborn achievements.
Defeat Qua'Lon.
Defeat Qua'Lon on Hard difficulty.
Defeat Dhacian! Big surprise huh?
Defeat Dhacian on Hard difficulty.
Find St. Theresa's Battle Armor in the big chest in the Celestial Nexus.
Defeat Saehral.
Defeat Shynn.
Unlock the final class change.
Complete the arena.
Defeat the Titan.
Complete the Experimental Potion for Atlas.
Unlocked the second class change.
Unlocked the first class change.
Defeat Fafnir.
Defeat the Sand Dozer.
Defeat the Lamia.
Find the Stylish Hat in the big chest in the Coal Mines.
Find the Circuit Breaker in the big chest in the Coal Mines.
Find the Sapphire Bracers in the big chest in Granminster Prison.
Successfully defeat the sky patrol.
Celebrate achievements being added to the game! Thanks for waiting!
Return Laryn's wedding band.
Finish Alda's Trial of Arms in record time!
Collect all Spades cards, and clear the Venom Depths.