Flock

Aunt Jane will give you a quest to scan odd energy readings throughout an area. These are dark and colorful blotches on various things (check your map). Once you turn that one in, she will give you a quest to identify a mysterious creature. Look in the circled area on the map and start scanning the floating blobs of color among the grass.

Once you’ve scanned enough of them, you’ll be given a quest to find the creature. It’s a dark Rustic, and it’s a master of camouflage. You will be required to pursue it around the map, and look for small bubbles of color to scan when it disappears. Eventually, it will tire and you can identify it. The various characters will give you options to name it. Just pick one (it doesn’t matter which) and the achievement will unlock.