Dododex
ARK: Survival Evolved & Ascended Companion
Tips & Strategies

You don't need to tame it for it to produce Achatina paste. It will produce it in the wild on its own, so putting it in a pen close to water (wild Achatina needs to be close to water or it will die, as per the Ark wiki) will allow you to take advantage of this. Seeing as the paste is tough to see due to its size, it's recommended to build your pen on sand, or on any other terrain free from clutter.
Note that this has been only tested out on single player.
More Achatina Utility Tips
Just tame 5 or 10 of these and put inside them a lot of Stone or something heavy so they cannot move when you put them into patrol. With that, they passively generated 100 achatina paste every hour. When you don't take those achatina paste, they start to generate organic Polymer. Just make sure those snaila cannot move and you have a nice auto-paste farming.
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.
(It also works with organic Oil)