The Aria Add-on for Killer Instinct has 14 achievements worth 150 gamerscore.
Win 20 ranked matches with ARIA
Reach 80 Fight Challenges with ARIA
Defeat 6 different characters in online matches as ARIA
Defeat 10 opponents in one Survival as ARIA
Win a Ranked Match as ARIA
Earn a supreme Victory in an online match as ARIA
Win an exhibition match vs a friend as ARIA
Reach 30 Fight Challenges with ARIA
Unlock a color for ARIA
Hit your opponent with Crescendo, Allegro, and Dissonance while in ARIA's Instinct Mode
Win a survival match as ARIA
Win a versus match as ARIA
Complete 200 matches as ARIA
Reach 150 Fight Challenges with ARIA