Here is the full list of all 31 Pixel Piracy achievements.
Check out the Main Menu credits
Horke the Flatulent poops
Plunder an enemy ship
Die for the first time
Visit a panda island
Capture an enemy ship
Visit an island with no town
Set sail for the first time
Visit a tavern
Pick a fight with a legendary pirate
Defeat a legendary pirate
One of your pirates dies while using Kaboom
Kill a hobo
Capture an animal to be your pet
Have at least 5 poop on your ship
Find a treasure chest and open it
Have a pirate turn hostile due to low morale
Add a pirate flag to your ship
Accept a bounty quest
Have both Vitali Kirpu and Alexander Poysky on your ship
Have 5 of your crewmates wear diapers at the same time
Capture 50 animals
Defeat all the Legendary pirate ships
Have 10 or more pirates on your crew
Have a seagull poop on your ship
Kill a total of 1000 enemies
Dig up 10 buried treasure chests
Unearth an epic buried treasure
Loot a total of 10000 gold
Find a stranded hobo
What was that? Did we just travel to hell?