The Expansion Pack 2 Add-on for Magic: The Gathering - Duels of the Planeswalkers has 3 achievements worth 50 gamerscore.
Put 8 lands onto the battlefield in one turn (Expansion 2)
Defeat Sorin Markov in the single-player campaign (Expansion 2)
Win a 3- or 4-player Xbox LIVE match (Expansion 2)