Why is there All collectibles and 100% for ILs? They're pretty much the same and I don't understand why the same category is on there twice.

This fourm thread is for discussing 100% strat science and so on. I'm also using it to ask a question, someone mentioned, I think it was demolition, that mellow mode helps 100% in one level, and which one is that? I'm interested to see where it could help out and what cool stuff that could lead to.