C rank requirements:
New Jutsu: 5 C rank
Stats: maxed out
Missions completed:
Help around the hospital: C (not counted, cannot count because no one is in thread)

Kill or capture the gorilla: C (Akaneya for this one): http://www.narutosaga.com/t29727-kill-or-capture-the-gorrilla-akaneya-private

Residency: D (Not counted, cannot count because no one is in thread.)

Other threads for rank up:

http://www.narutosaga.com/t29725-having-brunch-with-the-hokage-private-takao

http://www.narutosaga.com/t29684-a-day-for-training-open

http://www.narutosaga.com/t29703-blueshift-dreams

http://www.narutosaga.com/t29741-red-finger-chiaki

And that's about it!