You can not, it is impossible and illegal, please pay for it like everybody els.
xbox marketplace
You can download Halo Reach on the Xbox marketplace.
Press the guide button then got to "Marketplace" and press "Redeem Code" type it in and press start. Done
You can download Anniversary Maps to Halo: Reach but not to Anniversary.
there are no cheat codes. i am an inheriter and i have done every thing in the game and no cheat codes are on halo reach.
you could buy it or get it illegally halo reach code generator. very very illegal it generates codes
no you cant get halo reach for free but you can get the demo
game
y3.com
nowhere there are not cheats for halo reach except Easter eggs and glitches
Yes there is
download halo waypoint app