How many emergency/abnormal checklists are there for a typical airliner?
How many checklists does a typical airliner have for
  unusual/abnormal/emergency scenarios?


Many. A book. The abnormal checklists usually compile to a book and it is located in the cockpit at all times.

As an example, there are 452 pages on the QRH of the Boeing 737. I counted 212 abnormal checklists using the index pages.