I'm not sure why you wouldn't have gotten the December badge. I awarded it.
If you check http://www.wikitree.com/index.php?title=Special:Badges&u=5951227 near the end of the month, it should tell you whether a badge will be awarded. Maybe you could check in this month and post here if you don't get the badge for January. Let me know if you don't and I'll dig in deeper to see what's going wrong.
The December badges have been awarded, I'll flag this for someone to issue the badge for you. For more information on badges and how they are earned see the following page.