Here is the full list of all 8 Just Spin achievements.
Complete 100 levels in Adventure mode.
Earn a high score of 1,000 points or more in any mode.
Earn a high score of 1,000 points or more in Fast mode.
Buy everything from the shop.
Earn a high score of 1,000 points or more in Insane mode.
Complete 50 levels in Adventure mode.
Complete 25 levels in Adventure mode.
Buy something from the shop.