The Tusk Add-on for Killer Instinct has 14 achievements worth 150 gamerscore.
Win a versus match as Tusk
Reach 30 Fight Challenges with Tusk
Win 20 ranked matches with Tusk
Unlock a color for Tusk
Earn a supreme Victory in an online match as Tusk
Defeat 10 opponents in one Survival as Tusk
Defeat 6 different characters in online matches as Tusk
Complete 200 matches as Tusk
Win an exhibition match vs a friend as Tusk
Win a survival match as Tusk
Reach 150 Fight Challenges with Tusk
Reach 80 Fight Challenges with Tusk
Win a Ranked Match as Tusk
Skewer an opponent 5 times in a match in any mode.