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