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