I just wonder if Android SDK has special tool for achievements implementing. I want to add some in my game project, but don't know the best way to do it.
Thx in advance
I am not aware of Google specific release, but a lot of Android games is utilizing Open Feint. With Open Feint, you can provide achievement and rewards for your game.
For specific page for how to implement achievements in OpenFeint, see the OpenFeint Tutorial