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