The Rash Add-on for Killer Instinct has 14 achievements worth 150 gamerscore.
Reach 150 Fight Challenges with Rash
Complete 200 matches as Rash
Win 20 ranked matches with Rash
Reach 80 Fight Challenges with Rash
Defeat 6 different characters in online matches as Rash
Win an exhibition match vs a friend as Rash
Hit your opponent with a Speeder Bike 3 times while in Rash's Instinct Mode
Earn a supreme Victory in an online match as Rash
Win a Ranked Match as Rash
Defeat 10 opponents in one Survival as Rash
Reach 30 Fight Challenges with Rash
Unlock a color for Rash
Win a survival match as Rash
Win a versus match as Rash