Top 10 in Top 10 best comics about Batman that have not been made into a movie.
The Golden Age Batman is a good comic that tells the origin of Batman from Detective Comics #27. This Batman has been replaced continuously over the decades in Batman stories, but sometime between the 60s and 70s. has appeared many times through many stories through space and focus on Earth-Two.
Finally, his origins are recounted in Secret Origins Vol. 2#6 by Roy Thomas and Marshall Rogers. Therefore, it probably won't be made into a movie because it's something that only makes sense inside a vast multi-world universe where different Batmans gather.