Killer Instinct
464 Achievements
4,935
354-432h
PC
Competitive Arbiter
You have won a ranked match as Arbiter!
5
0.13%
How to unlock the Competitive Arbiter achievement in Killer Instinct - Definitive Guide
Select The Arbiter whenever he appears in the free rotation and load up a ranked match. You do have to win, it may be hard against random people because I know they like to go try-hard. I do believe it is possible to invite a friend to ranked in order to cheese the achievement. If not, do your best and spend some time learning the game.
See "Battle-worn Arbiter".