The Garruk's Revenge Add-on for Magic 2015 - Duels of the Planeswalkers (Xbox 360) has 5 achievements worth 100 gamerscore.
Achievements they've won
Achievements they've not won
Have ten or more Thopter artifact creature tokens on the battlefield under your control
Complete the Alara collection
Add an unlocked expansion card to a deck
Control creatures with total power 20 or more with the Garruk deck
Defeat Captain Vronos