Goat Simulator

At the very start exit the cage and stand outside the cage. Press to change characters and go to the first character and press to lick him. Press again and with this character run up to the second character and lick him . Press [cn_RB ]to get your fourth character. Run up to the third characters and again press . Once all four of them are linked by tongue at the same time your ach should pop.

This achievement is simple like almost all of the goat simulator achievements, all you have to do is get all of the animals to break out of their cages then lick another animal. When you first spawn as the goat headbutt the cage door and stand in the middle of the zoo, now press rb to change to the dolphin then break out of his cage and lick the goat from here press rb again to change into the flamingo, again lick the dolphin, then change again and do the same with the camel. On completion of all the animals licking the previous animal your achievement will pop.

If you have any trouble with the achievement I will leave my video guide below to explain further

Without a doubt the easiest solution. Start with the goat and the hit RB to select the next animal. Start, respawn and you will be with the goat. Do for the remaining two animals. Found this easier because you don't have to navigate.