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