Originally Posted by MCSS Aerocoupe
You can't have 2 Live accounts playing this game at the same time on the PC. Your profile will be Player 1. There will be no profile for Player 2.
For the achievement for all levels played with another person, you can have player 2 drop in just before the mission ends and drop out at the start of the next mission.
For the Kul Teska achievement, you will have to get Profile 2 to get enough points to buy the invincibility cheat and then beat him without Player 2 dropping out since the points collected will not be saved.
how do you get the other player to "drop in" on the PC version. I have a controller hooked up, but the keyboard and mouse and the controller all control player 1. how do i get the keyboard to control player 2?