TRON: Evolution

If you got this game and can't find many people online to get light cycle kills in multiplayer, just do this: start chapter 4 and race the first two checkpoints during which there are two easy light cycle kills. The whole quit / restart / race cycle is only about a minute each time so even if you need the full 100 kills for the achievement you only need about an hour for 50 runs.

I still found enough people online for the other online achievements so the full 1000 should be do-able even this far after release.