Killer Instinct 2 Classic

To make this achievement easy, go into the options menu and set your difficulty to extremely easy before starting an arcade ladder. You need 40 wins total to obtain this and it does not matter if you die in between wins or not. The easiest way to obtain this is to set your difficulty low and then start an arcade ladder. The first few enemies barely fight back. After 3-4 battles the enemies get smarter and stronger. You can at this point quit back to the main menu and restart a new ladder and your previous wins will all be saved. The achievement unlocks during the victory cutscene of your 40th win.

*edit: it has been reported playing 2 player with an extra controller will work as well but seems to be glitchy for some*

*re-edit: 2 controller method has been patched and no longer works at all