Specifically happens during a string of lvl 20 quests that lead you into joining a Grand Company. Then you'll have to do a quest to get a Chocobo Issuance Form, also. Which involves getting 2000 seals for your respective company. Pretty much just farm Fates, do GC quests, or fill out the companies specific logs from what I can tell. (I just got mine last night so I'm not sure if there's anything else.)
Besides the standard Chocobo, the White Mage's Unicorn, the CE mount and the Vet. Reward mount, are there any other confirmed mounts in the game?
I know once you "unlock" a mount, any class of any level can use it, but I've only see 3/4 in game. Haven't seen the Vet. Reward mount (90 Days) due to it being the trial period now, but some players have said they seen it. Would kinda suck if there's only 4 mounts currently as I like collecting mounts and minions/non combat pets, in MMO's