Here is the full list of all 23 Sphere Game Legendary achievements.
level 1 completed
level 2 completed
level 3 completed
level 4 completed
level 5 completed
level 6 completed
level 7 completed
level 8 completed
level 9 completed
level 10 completed
level 11 completed
level 12 completed
level 13 completed
level 14 completed
all levels completed.
you got a coin.
you got all coins.
you got a skin
you got all skins.
pass a level without losing a single time
you died 75 times
you died 150 times
you died 250 times