Response to Feedback
First off, welcome to the Boards! I hope you get some good feedback.
Thanks though I am not exactly new. I am the Tamara Henson that formatted Dragons: The Scorching quite a while back.
http://www.enworld.org/forum/rpgdownloads.php?do=download&downloadid=355
Thank you very much for the feedback. I am going to address the feedback a little out of order to retain context.
Finally, I'll ask if maybe you want to make this the only Patron available in your setting? It occurs to me that hat you have is robust enough that all Warlocks could be shamed (and possibly all have Fetish, rather than Chain or Blade). That would justify the range of animals available. It would also really mark the class as distinct. If not, then consider narrowing the field of animals, so that it's less of a grocery list -- pick the 4-5 "best" ones. Since you have rules for adding more anyways, it might make it less overwhelming.
Pretty much Yes. In this setting the Shaman is the only culturally approved way to be a warlock. In Ionia the Fae were the original inhabitants of the land and they pretty much played god with their subjects, making animals into humanoid servants (how the world got its gnolls, tabaxi, and stuff) and eventually mutating their own subjects into monstrous soldiers of war (how it got goblins and similar things). They then got theirs by the gods and Sidhe nobles fled into the feywild. Those commoners left behind became the elves, gnomes, etc. As a result no one would trust an Archfey warlock any more than one would trust one with a pact of the fiend. Those with either Fae of Fiend pacts will immediately be considered "up to no good" no matter their actual motives. On the other hand those who pick those pacts will have some good roleplaying to do.
There is also no Great Old One pact as I really can't think of a way to justify Lovecraft in this setting. Note: There will be no Tieflings either as there was never any ancient devil-worshiping cult, I am going to make a fey variant for that race instead.
The paper given here is actually cobbled together from two chapters, one on the Shaman itself (for players) and one from an appendix giving the laundry list of spirits. The final version will give a 'quick build shaman' write-up that will narrow the choice down to just a few totems. I included the 'laundry list' as I needed to know if any of their invocations were unbalanced.
Sometimes the connection of the animal invocation is not clear. Why can buffalo fabricate?
This is linked to the Buffalo/Cows connection with feeding/clothing the whole tribe. Originally every part of a cow was used - meat for food. hair for cloth, hide for leather, bones for musical instruments, hooves for glue, etc. This can also be found in Buffalo's taboo. Fabricate seemed the closest 5th edition spell to this concept. If anyone can think of a better SRD spell to replace it I am willing to change.
The level 1 ability (Detect Spirits) seems powerful, but pulls together a neat assortment of oponents/allies
I will specify in the description that the warlock must state that he is using this power and must concentrate to do so. It is not automatic. That should help with the power creep.
The DC for dispel seems really high. It will be hard for creatures to resist this.
The DC was from a 3rd edition book. Would lowering it to 8 plus Proficiency and Charisma (or possibly Wisdom) bonus work better?
Greater Familiar is not clear as written.
Seems clear enough to me. You can add the Celestial, Fey, or Fiendish template to your familiar. If you already have a familiar you have already (as per the core rules) specied whether it is a fiend, fae, or celestial so can only add the template that matches your animal's type. So if your cat is of the fey type you can only add the Fae Creature Template. The templates themselves will be in the Bestiary chapter. The Templates by the way give your familiar such neat things as demon (or angelic/faerie) wings, divine/unholy attacks, and other things to make your familiar stand out but without raising CR.
5. Tattoo Magic is a fun idea.
Oddly enough the feedback I have gotten elsewhere has indicated that this is the most broken of the abilities. I am thinking of re-wording it and making it into a feat.
Actually there are a few in the MM such as the Half-Dragon and Shadow Dragon which are templates. The templates are a bit wordy which is why I omitted them but I have used them on a few animals and CR stayed the same. The result is mostly to make all familiars Special not just pseudodragons, imps, and quasits. With the Fiendish template (for example) your cat is just just a cat with the fiend type, its a bat-winged cat that can do necrotic damage (equal to the creatures HD so a cat would just do 1 point of slashing damage + 1 point of necrotic damage) with its claws once per long rest. It also gains +3 to intelligence, has darkvision, immunity to necrotic damage, resistance to fire damage, and can now speak Abyssal and Infernal. Thus making the familiar a bit more fun to role play and more likely to survive certain encounters. 
