No you need xbox live for certain achievements!
No, it is not possible to COMPLETE the armory in halo 3 without an xbox live account. This is because certain achievements and goals needed to unlock specific armor permutations can only be achieved online - such as mongoose mowdown (requiring you to kill someone in a ranked free for all playlist by running them over with a mongoose). Despite this, it is possible to complete a large amount of the armory without live - due to these requirements being possible to meet offline.
You have to have Xbox Live to have the katana. As some of the 49 achievements are online. All i know is that my friend never had live and got the katana...soooo all i gots to say is get all the achievements that dont involve live and u should get it :)
you cant you can get more to get the locked armor by getting the new achivments and the mythic map pack. pop
If you have xbox live ask for budhaztm
You have to get achievements when you playing with a Live account.
there are alot of special achievements. one group are the new achievementsts put on by bungie, but there are also Vidmaster achievments, which are 1. find all the mythic skulls 2. in halo ODST, finish a level on legendary without throwing a grenade or shooting 3. in halo ODST, finish the last level on xbox live on legendary, with the iron skull on, only on mongeese 4. in halo 3, get to the rank of lieutenent on xbox live 5. in halo 3, get seven exp in any playlist on the seventh of the month 6. in halo 3, finish the last level of halo 3 on legendary with iron skull on, and only use ghosts, with 4 people over xbox live 7. in halo ODST, complete the 4th set on firefight on heroric, on xbox live with more people A great website to get help with these is achievementhunter.com, run by roosterteeth. Their videos will show you how to find tricks, and complete the achievements.
Yes, you can play firefight in Halo 3 ODST without Xbox live.
They are from the pc, online xbox live account. What ever achievements you earn from that game goes to your xbox live account's gamerscore and be classified as "Halo 2: PC".
Halo 3 gamer points are points that you get from completing a achievements in the game. This points are seen on your xbox live profile and are for bragging rights.
Halo: Waypoint is an Xbox Live only application. It isn't an actual game, only a way to track your progress with achievements in the many Halo games.
matchmade means that you can do it in matchmaking or on xbox live with a friend in custom games
You can get just as far without live as you can with live so inheritor