no
for multiplayer you must do it online to unlock them and for campaign it will unlock if you do what is required to unlock the camouflage.
You can play through each difficulty and unlock the achievement for it, playing on Legendary will unlock Hard and Normal Difficulty achievements retroactively without having to play through again
you can get it at campaign or unlock it on multiplayer
beat campaign on legendary
complete the campaign then you will unlock it
You need to complete the campaign and then you will unlock zombies>
you have to complete halo 3 odst on legendary, have xbox live and complete halo 3 on legendary
Spartan (Heads) Mark VI: Already Unlocked. CQB: Already Unlocked. EVA: Complete Campaign on Normal, Heroic or Legendary. EOD: Complete Campaign on Legendary. Hayabusa: Collect all 13 skulls. Scout: Unlock the "Used Car Salesman" achievment. ODST: Unlock the "Spartan Graduate" achievment. Mark V: Unlock the "UNSC Spartan" achievment. Rogue: Unlock the "Spartan Officer" achievment. Security: Get 49/79 achievments. Recon: Unlock all Vidmaster Achievments (Halo 3 ODST needed). Elite (Heads) Combat: Already Unlocked. Assault: Already Unlocked. Commando: Unlock the "Overkill" achievment. Flight: Complete Campaign on Herioc or Legendary. Ascetic: Unlock the "Steppin' Razor" achievment. -------------------------------------------------------------------------------------------------------------- Spartan (Shoulders) Mark VI: Already Unlocked. CQB: Already Unlocked. EVA: Complete "The Ark" on Normal, Herioc or Legendary. EOD: Complete "The Ark" on Legendary. Hayabusa: Collect 9 skullls. Scout: Unlock the "Mongoose Mowdown" achievment. Security: Get 750/1750 gamerscore. Recon: Unlock all Vidmaster Achivements (Halo 3 ODST needed). Elites (Shoulders) Combat: Already Unlocked. Assault: Already Unlocked. Commando: Already Unlocked. Flight: Complete "The Ark" on Herioc or Legendary. Ascetic: Unlock the "Overkill" achievment. -------------------------------------------------------------------------------------------------------------- Spartan (Bodies) Mark VI: Already Unlocked. CQB: Already Unlocked. EVA: Complete "Tsavo Highway" on Normal, Herioc or Legendary. EOD: Complete "Tsavo Highway" on Legendary. Hayabusa: Collect 5 skulls. Scout: Unlock the "Too Close to the Sun" achievement. Recon: Unlock all Vidmaster Achievement (Halo 3 ODST needed). Bungie: Only Bungie employees can get flaming helmet. Elites (Bodies) Combat: Already Unlocked. Assault: Already Unlocked. Commando: Unlock the "Triple Kill" achievement. Flight: Complete "Tsavo Highway" on Herioc or Legendary. Ascetic: Unlock the "Up Close and Personal" achievement. -------------------------------------------------------------------------------------------------------------- I hope this answers your question iFirePenguinAirstrike
You must complete the hard campaign to unlock ace mode
You unlock the mount Zebra at the highest level in multiplayer, which is 4th Legendary level 50.
You have to do the campaign levels on heroic or legendary and complet the campaign for the achiev and you get armour, ou also get about 3 pieces by getting achievs in matchmaking.
To unlock Pichu, complete Event 37 called Legendary Pokemon.