Can't connect to Online play.

[SCE_Un4goten_Syn]

I bought the Introversion pack because I might actually play some of those games because they looked interesting but, the reason I bought in the first place was so I could get the "You killed Santa Claus" or whatever it's called achievement. I tried going to Online play because I figured that's where it was. Is this wrong? I just really want to blow Santa out of the sky.