Here is the full list of all 15 Driftmoon achievements.
Find 100 silver feathers.
Find 70 silver feathers
Find John Egg's buried pirate treasure!
Find the Mystic Staff.
Get rescued at the last moment by Feagle.
Find the first goldfish.
Find the Hoe of Doom.
Find all the goldfishes.
Defeat Ixal and save Driftmoon.
Find the lost WEGO brick.
Use all blueprints at least once.
Finish all quests with a good ending.
Get at least 20 karma points. (21 max)
Play whole game on the hardest difficulty.
Tip: a seemingly useless item.