2 Melee PT (8DD), 1 BRD, 2 WHM, 3 SMNs, 2 SCH, 2 PLD. - Don't need that much, it's just safest this way. It is killable with 13-15 that have experience np.
Full buff Embrava.
Take it to 80%, PLD takes hate, melee kill adds.
Take it to 60%, PLD takes hate, melee kill adds.
Take it to 52%, PLD takes hate, melee group up on the side, recieve full buffs (re-embrava if required) and recieve PD off SMN. Soon as PD on melees need to engage with the intention of it being taken down to 12%.
At 40% PLD diagas all the adds and tanks them alone in the corner for the rest of the fight.
Take it to 12-13%, all melee disengage if they don't have hate and run away. One or two melee with the most hate must stay on Odin. They will take Odin down to 10% and be sacrificed with his AOE KO move. While this happens the main DD party will have a SMN in party. The SMN will PD when the two melee remaining on Odin die.
-- IMPORTANT: This phase must be done efficiently. If not you may face the 2 melee left on Odin getting hit by needles and dying. If this happens have your strongest melee standing engage Odin and take it down. Your 2nd PLD should be on hand to make sure Odin doesn't attack mages or melees. --
Soon as the KO move hits, SMN uses PD and the melees finish him off. There isn't really a need for this 3rd SMN, however if you have a bad run and only 2 melees are left alive - that perfect defence will ensure Odin dies before your melees do!
I'd go into detail but there isn't much point. It's relatively straight forward to perfect and it is the strat i've used since it came out. Only thing to really note is make sure you're group is well equipt and good at thier job. Arise is really handy for this fight as it does a pretty much guarenteed 1 shot move. Taking more melees will help if you lack the damage but it's not a necessity if the ones you have are good enough!
Good Luck :)