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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.