Here is the full list of all 26 Braveland Pirate achievements. It takes around 15-20 hours to unlock all of the achievements on Windows.
The Great Reaper defeated.
Game completed without using the easy level of difficulty.
All the bosses defeated.
Looted all treasure chests and hidden caches.
All pirate tricks learned.
Have answered all the questions of the sages.
Jarl Erik defeated.
All four equipment items on.
Rejected the Iron Bank's offer.
Six pirate tricks learned.
Bought an item for hero.
Fought through all dungeons and arenas.
Sir Rodrick defeated.
Davy Jones defeated.
Looted 7 treasure chests and hidden caches.
Pirate trick learned.
You defeated the army without losing a single warrior.
Cabin boys have joined you.
Page on Facebook or Twitter visited.
Game completed using only the hard level of difficulty.
Visited all islands.
Have overcome 25 random encounters in the sea.
Have won 150 battles.
Fulfilled all the assassination contracts.
Rejected all the assassination contracts.
Obtained the old man's artefact in the sea.