Sometimes I try to mitigate this by arbitrarily excluding big obvious names from my list (no beatles, no radiohead, ect).
but usually I just make sure i try to focus on a list being about records that had a personal impact on me or are special to me in some way beyond just "I think this music is better than that music".
what better sh*t do I have to do right now? probably not much. but I don't promise I'll make one. compiling 100 albums seems easy, but I always end up spending ages listening to many of the albums to determine the order, or if it even belongs on the list anymore, sorting through my collection in all formats, and so on.