The Garruk's Revenge Add-on for Magic 2015 - Duels of the Planeswalkers (Xbox 360) has 5 achievements worth 100 gamerscore.
Add an unlocked expansion card to a deck
Defeat Captain Vronos
Control creatures with total power 20 or more with the Garruk deck
Complete the Alara collection
Have ten or more Thopter artifact creature tokens on the battlefield under your control