Just in time for Quantopian's factor model lectures here's a notebook containing the full list of fields available from Quantopian's fundamentals database - ready to use in pythonic form, complete with example. I've been working with fundamentals data quite a bit lately and going back and forth between the docs and the notebook gets old quickly. I hope this list is useful to someone else as well.
A word of caution: querying the entire database at once is almost guaranteed to crash your notebook kernel. Work with smaller groups of fields instead.