I can’t seem to find a lot of the goodie bags. Have they retired? I see the achievements, but no items.

Some of them have different names than those listed under achievements (for some fun confusion). Here are the ones I think you need (lmk if there are others you're missing):

(and various other colours, just type 'Fifth Anniversary' into shop search and they'll come up) & various other colours & various other colours

You’re the best! Thank you!