The Playable Hero Pack Add-on for Marvel: Ultimate Alliance (Xbox 360) has 5 achievements worth 100 gamerscore.
Unlocked all the outfits for Cyclops.
Unlocked all the outfits for Nightcrawler
Unlocked all the outfits for Hawkeye.
Cyclops has spoken with Jean.
Unlocked all the outfits for the Hulk.