Halo 4 Xbox 360 avatar awards.
Carry out the following tasks to unlock the corresponding
new costume items for your Xbox Live Avatar:-
Knight Helmet Earn the "Knight in White Assassination" Achievement
Platinum Mark VI Helmet Earn the "Wake Up, John" Achievement
UNSC Infinity Hoodie Earn the "Not Some Recruit Anymore" Achievement
Carry out the following tasks to unlock the corresponding Specialization Ranks:-
1st Set of Armour Reach Specialization Ranks 2-4 to unlock the entire 1st set.
2nd Set of Armour Reach Specialization Ranks 7-9 to unlock the entire 2nd set.
Weapon with Alternate Skin Reach Specialization Rank 5.