Take merchant alliance voyages by speaking with the merchant alliance rep on the dock of any outpost. These voyages are by far the hardest and most time consuming.Wait until you are at an outpost before going on one of these voyages
as they generally require you to find specific animals and deliver them (in the cages you are given at the outpost) to another outpost
Use this map if you need to know where to look for different kinds of animals:http://www.ign.com/maps/sea-of-thieves/interactiveAnimal Care:
All animals need to be kept above water. You don't want them to drown. I usually keep them on the top deck, but you can keep them anywhere. Do pay attention if they are below deck though, because if you have a leak in your boat all your animals could perish pretty quickly.
Simply keep them out of the water. A submerged animal can't live long.
Pigs need to be fed. Every few minutes you have a pig in your possession, be sure to feed it a banana.
Snakes can't be caught unless they are soothed by music from your hurdy-gurdy or your concertina. Once they seem 'sleepy' you can capture them, but be careful about where you store them. Snakes that wake up can kill your other animals. If they get too bitey on your trip you can play an instrument again to soothe them.
Finish 250 voyages for this one. Good Luck. This can be tracked in your merchant alliance commendations