Console Monster writes: "We have just added the new achievement for The Maw on the Xbox 360. The achievement can be earned on the level: 'Brute Force' which was released earlier this week. Expect to see more achievements added when the next downloadable levels release.
Brute Force - 15 GamerScore
Get 100% Eaten and Eat the Snuffle in Brute Force
The list now contains 13 achievements worth 215 GamerScore. The rest of the achievement list can be viewed here..."