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So the Pathfinder Rail Rifle, the Piranha, the Tetra, and the Hammerhead extra turret options are not in the Codex.
Which of these are game legal and am I missing any?
The Human Auxilaries and Pathfinder Rail Rifles are on GW's website and ARE tournament legal.
Hammerhead Turrets, Tetra, Pirahna, Tau Sentry Turret Emplacements, Barracuda, Tigershark, Orca Dropship, Great Knarlocs, Skyray Anti-Air Tank, and Heavy Gun Drones are all Forgeworld models and as such are NOT tournament legal... except in perhaps a very few small RTT's where they MIGHT allow you to use them if you paid off the organizer with enough jelly beans.
Hope this helps!