In my experience, it's just easier to farm bugs on beelzebufo for cementing paste and use a pelagornis to farm organic polymer from wild/bred kairuku instead of using expensive resources to feed the achatina. I guess if you live in redwoods by a lake with irrigation pipes carrying water up to your trees base with tons of sap taps, then go ahead and tame an army. But if you're like me, and you live on the southern haven, you can't really get the resources needed for achatina efficiently.
Just find a couple wild ones then pick up with a flyer then put in a pen. Will excrete achatina paste still without taming. Also these guys can drop angler gel in mobile so, hunt them. More common in the redwoods and swamp junction.