Full list of all 12 Altered Beast achievements worth 200 gamerscore. It takes around 1-2 hours to unlock all of the achievements on Xbox 360.
Finish the game.
Start the game once with each of the four difficulty settings.
Score 350,000 points.
Reach the third level without losing a life.
Score 250,000 points.
Defeat the third level boss.
Defeat the first level boss.
Kill 30 two-headed wolves.
Play in an online multiplayer game.
Score 150,000 points.
Collect Spirit Balls from the first three White Wolves in any level - Single Player mode only.
Collect a Spirit Ball.