Here is the full list of all 20 Nelly Cootalot: The Fowl Fleet achievements.
Unlock all achievements in Nelly Cootalot: The Fowl Fleet
Recruit an unexpected crewmember
Fulfil an ancient prophecy
Take an interest in Gloomholm's deceased citizens
Interview the head Ptarmigan's supporter
Shoot down all the varmints on your first attempt
Track down Widebeard's Fowl Fleet
Become an aromatic master manipulator
Don't forget to return what you borrow
Find out what Sebastian thinks about 20 characters
Make the lookout see a harmless tug boat
Keep your eyes peeled in Chinatown
Catalogue all the stolen goods
When two seashells come together
Trounce Moses Melly first time around
Wrap your ears around all of Spry's groove
Join the Merchant Navy
Make sure everyone's a winner
Meet the denizens of the Toff Races
Escape the MS Undeliverable