you need to achieve all the achievements. you need to achieve all the achievements.
To get the Katana as an armor permutation in Halo 3, you need to get 1000gp in the game. The new achievements released for Halo don't affect it. The easyst way to get it is to get all the "old" achivements.
Unlock what head?
No such thing they patched in since halo 2
get all the skulls easily u can you tube it also u can play multiplayer online to unlock items getting halo ODST u can unlock recon by doing the vidmaster challenges in halo odst and halo 3
Unlock it where? It's already in it by default.
You unlock the armor.
you have to complete halo 3 odst on legendary, have xbox live and complete halo 3 on legendary
Getting the katana sword would mean you would have to unlock every achievement in the game. So you would need both the regular Halo 3 disk for the Campaign achievements and the mythic disk for the online and multiplayer achievements.
There isn't a known cheat code for this on Halo 3.
Your work for them.
No
Unlock Halo 3:ODST's Campaign Complete Achievement. Once you beat the ODST campaign, visit Halo Waypoint on the dashboard to unlock the item.