Full list of all 20 Angry Birds Seasons achievements worth 200 gamerscore. It takes around 10-12 hours to unlock all of the achievements on Windows Phone.
Ham'o'ween Finished
All Season's Greedings levels finished
Wreck the Halls finished
All Summer Pignic levels finished
Moon Festival finished
Trick or Treat finished
300 skeletons broken
300 chocolate boxes broken
300 Piggy Bunnies popped
1000 presents smashed
300 pots of gold broken
300 flowers picked
300 Cookies broken
300 lanterns broken
300 pumpkins smashed
Go Green, Get Lucky finished
Hogs and Kisses finished
Easter Eggs finished
300 pigs smashed
Orange Bird unlocked