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
Catalogue all the stolen goods
Track down Widebeard's Fowl Fleet
Don't forget to return what you borrow
Become an aromatic master manipulator
Keep your eyes peeled in Chinatown
Find out what Sebastian thinks about 20 characters
When two seashells come together
Make the lookout see a harmless tug boat
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