(For Example: Five Night's at Moms achievement is rumored to come from beating Mega Satan with Eve).
One thing that I've heard, though, is that some completions don't normally give you anything unless you have AB+. It also may not be wise to buy it currently either, since the developers are still handling game-breaking bugs and content. Majority of the items from it are achieved later on in the game. Maybe even play around with what you have some more to get better, but with the expansion of AB+, the game does get harder. If you know you're going to dedicate time into getting majority of the achievements, then go ahead and buy it. If you go off and play for 100 hours, the DLC will probably be worth it to you. Just play with what you have, it's more than enough. I don't see the point in expanding the content if you're not even sure you're going to be dedicated enough to the game to even get to the point of a tiny amount of extra content making a difference to you. Originally posted by Travis182:I've only played 27 hours and haven't found a lot of the content yet.