Achatinas are small snail like creatures that can be found on all maps apart from genesis part one in damp biomes such as the redwoods. In the wild they are completely passive and won’t fight back no matter what creature attacks it. It will simply slowly run away. When tamed, they will generate achatina paste (a substitute for cementing paste) and organic polymer. To keep up with the organic polymer, they have an increased spoil time of the organic polymer what it is in their inventory. So you can use them as mobile organic polymer fridges if you want to. They do generate organic polymer slowly though so I recommend taming multiple. To tame them you knock them out and feed sweet veg cakes. Fun fact when tamed they can wear hats. Overall a great tame. Would recommend any day.