If you're new to Halo, I would suggest buying the halo reach Legendary strategy guide, since it has key tips for beating the game on legendary according to the specific level. Otherwise, always find cover, try not to go out guns blazing, and HEADSHOTS HEADSHOTS HEADSHOTS! and you do one of the probable most important things in all of Halo................you don't die.
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You get an achievement and if you have halo waypoint, you get the CQB helmet. Well you actually get it on heroic but you get what I'm saying. You also get an attachment if you've completed halo 3 on legendary too. Hope this helps!
not that we know of. my friend beat it on legendary yesterday he has a retail copy got shipped early and it was the same as the normal one. he did it on co-op there might be one if u do it by yourself EDIT: I beat the game on legendary alone and still nothing.
No you still die at the end.
Codes for the Flaming Helmet were included with the Legendary Edition (MSRP $150.00 USD) of Halo: Reach. The only way to obtain them is to buy a Legendary Edition version of Halo: Reach, have a friend give you an unused code, or mod it (and get banned).
If you beat the last level on Legendary, during the final cutscene if you hold down the right analog stick you can see Either Master Chief or another spartan in a cryo pod.