How long does it take for it to register as me having all 16 of a color's items for an achievement to unlock, and can i have multiple sets equipped and the achievements still unlock
Are you an artist and want to make a decent amount of TC? Check out this thread.
Wait for a day or a week. But sometimes you will receive it in less than 12 hours.
If it doesnt arrive after a few days, you can ask on support about your problem.