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So basically get your assassins to a high level if you wish and sync with the Panthéon Sync Point and it will be one of the three missions there.
http://steamcommunity.com/sharedfiles/filedetails/?id=373987010
My English is not good but I'll explain how I got it.
After completed all missions on companion app (Including Les Invalides), I've collected all artifacts but Altair's outfit was still locked.
So, I restarted the game from my backup save files which before collecting artifacts and after re-collecting 20 artifacts, suddenly Altair's outfit unlocked with popup message.
Helix Rifts are very buggy, make sure backup your save files before collecting artifacts.
More details here.
http://forums.ubi.com/showthread.php/992085-Read-this-before-collecting-any-Rift-artifacts-especially-those-for-Altair-s-outfit
As Rize said, Backing up your saved game is important but from me, ITS A MUST! sometimes your game restart your progress as if you have deleted your game, once you exit the Uplay cloud will cloud the resetted progress save. GG then my friend, you lost all your progress in a minute. So always keep a backup no matter what, you'll need it