Here is the full list of all 21 Plunder achievements.
Escape the first dungeon in Plunder.
Open the Beggar's Gulf Gate.
Complete the game with any ending.
Gain entrance to Maiden's Tear.
Gain entrance to the Stronghold.
Unlock all 16 spells in your book.
Completely renovate the town of Deadskull.
Get Peggy the Parrot as a pet.
Get Quincy the Cat as a pet.
Get Oscar the Dog as a pet.
Use a treasure map to successfully find treasure.
Complete the "Fakers and Takers" quest.
Reach Level 60.
Catch a Golden Gullet, the rarest fish in the ocean.