Complete the following tasks to unlock Apple Game Center achievements.

Achievement	How to unlock
1,000 Points	Collected 1,000 points.
100 Yards	You mowed 100 yards in one go.
15,000 Points	Collect more points in challenges.
300 Yards	Mow 300 yards in one go.
5,000 Points	Collect more points in challenges.
Big Yawn!	Count more sheep.
Completed 10	Complete 10 challenges.
Completed 20	Complete 20 challenges.
Completed 40	Complete 40 challenges.
Discover Trainer	Discover the Trainer option.
Sleepy Head	Count more sheep.
Three-starred 10	Get three stars in 10 challenges.
Three-starred 30	Get three stars in 30 challenges.
Three-starred 50	Get three stars in 50 challenges.
Yawn!	You have counted 10 sheep.
Yuck!	Step in poo.