Quote Originally Posted by DrunkMonkGar View Post
I've only done one because I didn't even get extra coins for it. Someone a few pages back said he got a free premium gacha for doing all the chapter 1 normal challenges, but nothing I could find in game said that is a thing that happens.
I think that person just made a mistake, and was just referring to the free maiden pull you get for completing the Complete Campaign trophy.
So far I've completed all the challenges for Campaign 1 and got nothing.