first... there's a 'season showdown' mode in NCAA Football 10 that connects to the servers to keep track of stats. i'm not sure if a connection is required for the achievements, but there MIGHT be another 165GS that you can't get now with the servers gone. someone might want to check this, if anyone still cares.
second... i don't think we'll need to add FIFA 10 to the list, even when the servers close in a couple days. there's a really big glitch in the game that, in theory, can unlock every single achievement in the game -- although it's random and time-consuming. triggering the glitch is a HUGE pain, but it does not require a connection to the EA servers, or even to XBL.