Final Fantasy XIV: A Realm Reborn/Beast tribes

There are currently two beast tribes: the Amaljaa and the Sylphs. To complete both, it will take you ~50 days.

Relations experience
As you complete quests for the beast tribes your relations value will increase. When it maxes out it will level up and new quests will become available. In addition, that tribe's vendor will sell more items to you.

Each rank starts you at zero. When it is maxed out, speak to that tribe's leader to get the next quest. Once completed, you will go up a rank and your relations value will go to zero. The maximum value for each rank is:
 * Ranks
 * Neutral: 150.
 * Recognized: 360.
 * Friendly: 510.

Rewards

 * Neutral: crafting materials.
 * Recognized: beast tribe themed dyes.
 * Friendly: more crafting materials and dyes.
 * Trusted: beast tribe mount.

Strategy for getting beast tribe relations up
You can only complete 6 dailies total for all beast tribes in the game. Beast tribe ranks always take 10 days to level up. However, the way to do this changes.
 * At Neutral rank: pick two beast tribes (currently there are only the Amaljaa and the Sylphs). Do 3 dailies each day for 10 days to level them both up.
 * At Recognized: focus on a specific beast tribe. Do all 6 dailies for that tribe.
 * At Friendly: again, do 6 dailies for the tribe you leveled up. This time, only do the dailies for the newest two NPCs. For the Amaljaa that is Vurazz Vorr, and Narujj Bol.

Once you get trusted, do dailies for a different tribe.