Obviously fish identification, business of diving, PADI mermaid, and gotta have the boat and DSMB certifications!
I haven't taken Fundies/Essentials yet and I'm holding off until I have some time in a drysuit and doubles; I understand the argument that it's such a transformative class that even a 'Rec Pass' or a provisional pass is going to teach you more than the traditional EANx, AOW, Rescue, Drysuit, ITT/AN/DP path, but I'd like to see what DIR is contrasting itself against and have the cards versus having to fly somewhere to prove myself to a busy instructor and not be able to take advantage of any of their training in the meantime. It may cost a little more in the long run but small, iterative growth might be more sustainable than "all or nothing".