Alexander Goatstafsson is a Steam achievement.
To unlock this achievement, you need to go to the Fighting Ring in GoatVille and defeat 4 goats in duels. To beat them you must force them outside of the circle. Headbutting or licking both work.
The goats are harder to defeat as the rounds progress.
Reward: Ripped Goat, Goatborn
Trivia: "Alexander Goatstafsson" is a reference to current UFC Light Heavyweight Contender, Alexander Gustafsson. "Win the title bout!" is likely in reference to his recent bout against reigning Light Heavyweight Champion, Jon Jones.