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Those achievements are there because Tomb Raider Anniversary was released as a download for Legend (as well as being available on disc) If you download the Anniversary DLC then you will be able to play that game using your Legend disc and unlock the 250 achievement points connected to that DLC.
The DLC and disc versions of Anniversary are the same thing, the only differences are how you play it (either through a menu option with your Legend disc or by putting in the Anniversary disc) and the number of achievement points (According to Microsoft rules DLC is only allowed to add so many points, whereas the disc version contains the normal allowance of 1000 points)
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