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Say you don't have Halo 3, but you purchase Halo 3 ODST...
You get everything that's also in Halo 3, but its campaign, so therefore, in order to get all the achievements, you'll need to purchase the original Halo 3 just to get it's campaign.
Remember, you don't need halo 3 to play halo 3: odst.
[Edited on 06.20.2009 8:08 PM PDT]