Full list of all 12 Merchant of the Skies achievements worth 1,000 gamerscore. It takes around 8-10 hours to unlock all of the achievements on Xbox One.
Completed first quest
Refueled a ship
Feed the Fish God
Complete the Money Accumulation goal
Find the Giant Island
Buy an island
Put money into bank
Buy a new ship
Get bailed out by a bank
Supply the inns with bread and apple juice
Restore a lighthouse
Restore botanical garden