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.
Rejected all the assassination contracts.
Page on Facebook or Twitter visited.
The Great Reaper defeated.
Game completed without using the easy level of difficulty.
Game completed using only the hard level of difficulty.
All the bosses defeated.
Obtained the old man's artefact in the sea.
Rejected the Iron Bank's offer.
Have won 150 battles.
Fulfilled all the assassination contracts.
All pirate tricks learned.
Looted all treasure chests and hidden caches.
Have overcome 25 random encounters in the sea.
Visited all islands.
Jarl Erik defeated.
Have answered all the questions of the sages.
All four equipment items on.
Bought an item for hero.
Sir Rodrick defeated.
Six pirate tricks learned.
Fought through all dungeons and arenas.
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.