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