soo.. when I was checking achievements of others for some other reason… I noticed I was lacking a large number, pulled up an achievement guide and realized… I hadn't done most of the single player campaign… at least with achievements on my account. My cloud save also reflected that..

Not sure if I played on brothers/someone elses account, if co-op campaign was same puzzles but as 2 characters or what as I remember a good chunk. Even if it was a replay or just a first time doing single player its been long enough that it was a great experience regardless