Complete the following tasks to unlock Apple Game Center achievements.

Achievement	How to unlock
Bird Saver I	You saved 10 Baby Birds!
Bird Saver II	You saved 25 Baby Birds!
Bird Saver III	You saved 40 Baby Birds!
Bird Saver IV	You saved 75 Baby Birds!
Bird Saver IX	Save 1,750 Baby Birds
Bird Saver V	You saved 125 Baby Birds!
Bird Saver VI	You saved 250 Baby Birds! You are awesome!
Bird Saver VII	You saved 500 Baby Birds!
Bird Saver VIII	Save 1,000 Baby Birds!
Bird Saver X	Save 4,000 Baby Birds!