Here is the full list of all 15 Driftmoon achievements.
Find the Hoe of Doom.
Find John Egg's buried pirate treasure!
Find the first goldfish.
Find the Mystic Staff.
Get rescued at the last moment by Feagle.
Find 70 silver feathers
Find 100 silver feathers.
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.