Here is the full list of all 12 Chime achievements worth 200 gamerscore. It takes around 12-15 hours to unlock all of the achievements on Xbox 360.
Create a single quad that covers the entire width of the grid on every level.
Score a total of 50 million points.
Get 100% coverage or more on every level in 3 minute mode.
Build up a score multiplier of 25 or more.
Play all the levels in both Time Mode and Free Mode.
Create 7 quads on the grid in one pass of the beatline.
Completely fill the grid in Free Mode.
Have 3 active quads onscreen at once.
Create a quad containing 80 cells or more.
Find 6 different quad sounds on a level. Quads can be square, wide or tall, and either small or big.
Create a quad before the beatline has made its first pass of the level.
You've done a great thing and made the world a better place. Here's a little gift!