Is it still possible? Ive had all the pieces in my inventory for a couple of days, but seen no event for it, and its not changed on my achievements page. Am I doing something wrong? I usually am :0(

I've got it not too long ago (a few weeks) and it should be still avaible. You have to click on one piece and there should be an option to 'Create Frankenpie', you'll get the achievement after doing that.

Thanks a lot, I didnt realise. ill lock it now.