It only comes with the six maps and the firefight map, which are remakes of:
-Hang 'em High
-Battle Creek (well, Beaver Creek really)
-Prisoner
-Timberland
-Damnation
-Headlong
--And the firefight map is based on the cliffside tower from the level Halo
No other Reach maps come with it. To get them all, you need to use Reach. Anniversary does come with a voucher for downloading the Anniversary maps so that you can play them from Reach itself.
[Edited on 12.11.2011 11:37 PM PST]