Tap on your Farm House, then tap the Trophy icon to view your Achievements board.
Here you can see your progress for the different mastery tasks on your Farm.
Complete the mastery tasks to earn mastery stars and get rewards.
Related posts:
FarmVille 3: What are Story Tasks and Daily Tasks?
FarmVille 3: What are Pets?
FarmVille 3: How do I breed animals?
FarmVille 3: How do I unlock or upgrade Farmhands?
FarmVille 3: How do I see my Followers / Likers?
FarmVille 3: How do I get animals?
FarmVille 3: What is Happiness?
FarmVille 3: How do I use the Building and Decor Shops?
FarmVille 3: How do I use the Barn Storage?
FarmVille 3: How do I change the appearance of my buildings?