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