The Omen Add-on for Killer Instinct has 6 achievements worth 75 gamerscore.
Land 20 Rashakukens in one fight against an opponent in any mode as Omen.
Land 500 Rashakukens total against opponents in any mode as Omen.
Successfully land the Demonic Despair on an opponent in any mode as Omen.
Miss the Demonic Despair but win the round anyway in any mode as Omen.
Complete a combo that deals 85% or more damage in any mode as Omen.
Complete the Season 1 Mural