Core Keeper

To get this achievement you need two things. The first being a crop to feed to the cattle. The crop I used was a mushroom which was quite plentiful in my world's seed. The second thing you need is a hungry cattle which are large cow like animals. To tell if a cattle is hungry all you need to do is click A on them and the game will say "The animal is hungry for crops". Once you have these two things you simply need to hold the crop in your hand and the cattle will eat it and give you the achievement.

The "cattle" are friendly creature that spawn in the sub biome "meatdow" it can be found randomely in the dirt biome or in the azeroth wilderness. To feed them you just need to have any grow plant like hearthberry or glowtulip. Just like in minecraft the "sheep" and "cow" that you find in this biome will follow you if you have a heartberry in you hand. And you can feed her by right cliking or dropping on the ground the food source.

Note : after the paws and claws update they had some reserve to auto feed the animals, this doesnt give the achievement you need to manualy give here the food.