Teenage Mutant Ninja Turtles: Shredder's Revenge

This achievement requires you to complete a single episode in either Story Mode or Arcade Mode with either a couch co-op partner or an online partner. This will come naturally considering so many other achievements either require multiplayer or are far easier in multiplayer, but for the purposes of this achievement, if you have a second controller you can just have them join right at the end of the boss fight of any level, or if you don't have a second controller, you can jump into someone's lobby online and just finish a single stage with them. It can be on Chill difficulty, so this should be no problem.