Or you could just go to the OP.Good way to keep track of what's already BC vs what's available:
https://en.wikipedia.org/wiki/List_of_Xbox_360_games#List_of_Xbox_360_games_(A-L)
https://en.wikipedia.org/wiki/List_of_Xbox_360_games_(M-Z)
EDIT: Never mind. I misunderstood your post.