Here is the full list of all 28 Black Skylands achievements.
Complete the Prologue
Defeat Blast
Defeat Crash
Defeat the Devourer
Defeat Horos
Defeat Kain
Defeat Mort
Defeat Rhoda
Defeat Ruth
Get 5 Weapon Mods
Get 50 Weapon Mods
Get All Weapon Mods
Obtain Steel Condor Crossbow
Liberate 3 Islands
Liberate 10 Islands
Liberate All Islands
Liberate Mills Island
Get more than 1000 Weapon Steel
Get more than 6000 Weapon Steel
Get more than 17 000 Weapon Steel
Get more than 1000 Ship Steel
Get more than 6 000 Ship Steel
Get more than 17 000 Ship Steel
Defend the Moth Village
Find 5 Chests of Gold
Find 10 Chests of Gold
Find All Chests of Gold
Visit Swarm Territory