Someone named Calazet has compiled a list of 1500 books he thinks you should read as well as some serials.
You may have some trouble getting the long list to load. What's interesting is not what's there but what is missing as well as some texts which most would agree need explanatory companion texts. There are also, as of this post, some mistakes like listing Orwell's "1984" twice, once as a number and once as text. Also, Issac Asimov's "I, Robot" is seemingly listed as just "Robot" in the serial section at the end.
There are some good things on the list to be sure but there is a subtle bias present as I suppose all lists of this length would have. For example, there are several religious texts listed, yet no books against religion nor are any books listed that explain religious texts in context, historically.
Still it's worth a gander.