Brothers a Tale of Two Sons

This is unlocked in the same area as Black Sheep in chapter 1:


During Chapter 1, once you have passed the field with the dog chasing you, keep following the path until you see some rabbits jumping , on the path below. Go to them and pick up the white rabbit as the young brother ( )and drop it in the firepit in the middle to make the rabbit black.

This achievement can be unlocked in Chapter 1 after being chased by the dog in the field. Following the path will lead you to a new area. Follow the path, go down the ledge and take the path to the left. Here you will see some bunnies around a fire pit. Use the little brother (RT) to pick up the white rabbit. Walk over to the fire pit and let go of RT, this will colour the rabbit black and unlock the achievement.

The achievement can be seen in my video guide: