oh don't you worry, we've got some achievements planned.
i wasn't going to be mean and make them the first day of the new tot items ;)
The items are split into the groups (1-6) and then there are three subcategories (easy/med/hard) which are slightly weighted to go out a bit more/a bit less (it's not a big amount); it's used to be 5 groups when we did pets with six subcategories. We always have the current year and previous year for ToT go out. :)
So if you don't get all the items (from 2016) this year, you'll have a chance at them next year! And anything this year from before 2015, you might have a chance at via quests soon!