This is your go to creature on aberration, get like 2-4 and you don't have paste problems, in other maps you don't need them cause the bieverdams give more and it's annoying to hand feed them every time sweet vegetable cake, that's the only thing they eat even after tame. Only tame low level ones! Unless you wanna stand next to it like 20 min, only level on hunger. If they have 100 paste (maximum) they produce organic polymer and and it takes longer time to spoil poly in their inventory. They are breed able but it don't work right now because you can't feed them cakes (you can't put it in their inventory) only with mea wings it's possible but you need A LOT OF CAKES it isn't worth it because taming one is easier. They are found in the swamp and redwood some times, in aberration they are in the blue zone and in the border of the blue and green zone. That's everything you need to know.
TIPP: Achatinas can produce organic Polymer. You can just craft a fridge with the organic Polymer and destroy it. Every time you destroy a fridge you get normal Polymer back. That means you can transform organic Polymer to normal Polymer. I found it out yesterday by myself.