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