Use 42 InstantRocks to finish a level
Use 32 bridges to finish a level
Complete all Bubble Barrage normal levels
Complete all Bubble Barrage hard levels
Find the Tunnel of Love
???
Trap Toki Tori between two Switchbricks
Complete all normal levels without using the Wildcard
Complete all Forest Falls normal levels
Complete all Forest Falls hard levels
Complete all Creepy Castle normal levels
Complete all Creepy Castle hard levels
Complete all Slimy Sewer normal levels
Complete all Slimy Sewer hard levels