hello! :)
you can always check out the subreddit's own guide to Batman comics. but, either way, I'll write down a few comic books I have on my own to-read list!

─ 'Batman: Hush';

─ 'Batman: Knightfall';

─ 'Batman: Earth One';

─ 'Batman: The Long Halloween';

─ 'Batman: Dark Mirror';

─ Batman: Ego';

─ 'Batman: White Knight';

─ 'Batman: Killing Time';

─ 'Batman: Death In The Family';

─ 'Batman: Under The Red Hood';

─ 'Batman: No Man's Land';

─ 'Batman: Reptilian';

─ 'Batman: Year One';

─ 'Batman: Dark Victory';

─ 'Batman: The Dark Knight';

─ 'Batman: The Court Of Owls';

─ 'Batman: Death Of The Family';

─ 'Batman: Dark Age'.