Originally Posted by Matt Jo
someone told me this
"It turns out that if you play coop as bishop and complete the game on realistic only night gets the achievment. The way to fix it is to play a scene (any scene) as KNIGHT (very important, you must be player 2 this time). The achivement pops up as soon as you clear the scene."
true or not?
I played the story on my own, from start to finish, and managed to get the achievement. I've still never played Co-Op.