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I have had a gamecenter account from the start of this game but it still only registered half of my achievements. For example I have the Complete 5 Bloodlines achievement but I'm missing the complete 2 bloodlines achievement somehow.
I can't confirm this just yet, but I suspect you only earn achievements if you're online while playing because I'm on an iPod Touch and don't have WiFi everywhere, but oh well, it's annoying, and I do think its the games fault because my other Gamecenter games appear to work fine, but I don't care so much. The game is still awesome.
My issue is GameCenters fault, I tried another game offline and recieved no achievements I know I should have earned. I also noticed my other games worked normally because they would save locally as per OpenFient and later sync my scores and achievements with GameCenter.
That's pretty stupid of Apple to require you to be online to use GameCenter knowing they sell products such as the Touch that aren't always online, oh well...