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