Full list of all 20 Little Acorns achievements worth 200 gamerscore. It takes around 6-8 hours to unlock all of the achievements on Windows Phone.
Collected all Year 4 acorns
Cleared Year 4 Fruit and Par Times
Cleared Year 3 Fruit and Par Times
Fully cleared the entire game!
Collected all Year 3 acorns
Cleared Year 2 Fruit and Par Times
Collected all Year 2 acorns
Bounce between 3 different springs
Grappled 1000 times
Swung between 5 different grapple points
Jumped between 3 moving platforms
Jumped 2500 times
Cleared Year 1 Fruit and Par Times
Killed 3 enemies without touching the ground
Collected all Year 1 acorns
Played for over an hour
Collected 100 fruit
Grappled whilst powered up
Jumped to catch a falling baby squirrel
Kill 5 enemies whilst invincible