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yes you can get the skulls in splitcreen. all halo 3 maps are splitscreen. as for the 1 v 1 and other misc. achievements im not sure if you can get them. im gonna go home and try with my brother now.
yes all maps can be played in split screen, yes you can get the skulls in split screen i have done it, you can get some achievements playing 1v1 but most have to be done online with more people then playing from one console.
Hope i answered you question.