Killer Instinct Classic

Pretty simple. There are two methods you can use to get this. With and without a second controller.

The quickest method uses two controllers. While selecting your character, press the A button on second controller to enter Vs mode. Beat the second player. Now have the second player continue and do it 39 more times to unlock the achievement. For an even faster win, press down and medium kick (the B button by default) on the character select screen with both controllers to select the Sky stage. Then simply do a combo with your character to knock them off the edge of the stage for an easy & fast win.

Second method is to play against the computer (Arcade mode). After you win 40 matches, the achievement will unlock. To make this methed easier, set the difficulty to easy.

Bottom line is get 40 wins and achievement will unlock. It doesn't matter where you get the wins from (arcade mode and/or vs mode) as long as you get 40 wins with this character.

Ok, this is simple, and will save time. Your welcome! Lol!

1-Have 2 controllers ready to go. On the second control, just hit A at the Character Select screen, and it will sign it in as a Guest.

2-When you go to select the character you want to use, press Down+B on the first control, and then Down+B on the second control. (No, regardless of what people are saying, you did not have to hit them at the same time in version 1.5! Try it and you will see that it works!) This will select the Sky Stage.

3-This stage is smaller! Use a quick combo with the character that you are using that will send the second player into the sky and off the map. Find which combo is the best and quickest for the character you are using. If done correctly, only 2 or 3 seconds will go by and the second player will be off the map.

4-Repeat this process with the other characters to speed these achievements along. :)