As a pure neutral toon (no different than a newly formed toon) and with no allegiances to anyone - I have all 51 tribes maxed-out to possible fame ((50 Fame for 47 Tribes - 30 Fame for 2 Tribes and 80 fame for 2 Tribes (but since you can never have true max because of inter-tribe issues within regions) I have the next closest thing)) - where I use all of the tribes as my meatshields for Names and Bosses, plus ATM's for dappers.
It does take a ton of time because if you did start out with a faction (Kami or Kara) there is a good chance combined with your race, that some of your fame will start at -99 like mine did for 5 Tribes and in the beginning, it does not matter now many missions you do if you are below - 50, you can only take either the Kami or Kara to start until you get to -49 but getting there is extremely painful, only then can you take the Tribe Welcomer and only limited ones until you get to Zero, once you get to Zero, you can take the wandering tribe missions (hunter or prospect).
Also, Siela is correct about the "trigger" part because you have not done anything to affect the server-side to adjust your fame.
Hope that answers your question or inquiry.
Godspeed, Zatarga
It does take a ton of time because if you did start out with a faction (Kami or Kara) there is a good chance combined with your race, that some of your fame will start at -99 like mine did for 5 Tribes and in the beginning, it does not matter now many missions you do if you are below - 50, you can only take either the Kami or Kara to start until you get to -49 but getting there is extremely painful, only then can you take the Tribe Welcomer and only limited ones until you get to Zero, once you get to Zero, you can take the wandering tribe missions (hunter or prospect).
Also, Siela is correct about the "trigger" part because you have not done anything to affect the server-side to adjust your fame.
Hope that answers your question or inquiry.
Godspeed, Zatarga