I was wonder if the 'Pastry Madness' and 'Pastry Delivery!' achievements are still available right now.

I sent a pastry box to a friend via the 'Send to Buddy' link from my inventory but didn't get the achievement, so wasn't sure if it was now unavailable or if there was a special way to send it.

those achievements were only available during the most recent pandemic event. The boxes had to be sent when Skitters told you to, not just randomly.

Oh okay, thanks.

[edit] Pastry Madness is still available, and you can find your collection here.