Here is the full list of all 11 LostWinds achievements. It takes around 2-3 hours to unlock all of the achievements on Windows.
You have collected every collectable in the game
You have faced Magmok and won
You have found and opened the third memory chest
You have found and opened the fourth memory chest
You have acquired the jumbrella cape
You have found and opened the second memory chest
You have acquired the vortex ability
You have found and opened the first memory chest
You have acquired the slipstream ability
You have collected your first collectable object
You have acquired the double gust ability