Winning a Ranked match wont come easy. It takes knowledge of your character and knowledge against your opponent. The more you play the easier wins will come because you will learn the tendencies of online players. People are creatures of habit and you will notice that people repeat the same things over and over again online.
You only need to win once to earn this achievement.
For Spinal the best thing to learn quickly is how to build Skulls. Spinal is not very good without them, but once he gets them the match is yours. You get one from a throw, and you build a lot by using the Skull ender. Once you have Skulls doing a Skeleport and using a Skull to let you do a Spirit Sword out of the Skeleport is really good for catching people by surprise and starting combos. Always end with the Skull ender (until you get better of course) so you can keep building more skulls.