Achievements
-Clear Casual Mode
Complete the game on Casual difficulty.
-Clear Standard Mode
Complete the game on Standard difficulty.
-Destroy All Gold Chests
Find and break every gold chest in the game.
(All warp points to stages other than the boss room will have a star in the description.)
-View All Event Pixel Art
Unlock and view all event pixel animations.
-Purchase Everything from the Shop
Buy every item available in both difficulty shops.
-Earn All Achievements
Unlock every single achievement.
Maybe it was a little hard to understand...