Clear Zone 0 without taking any damage

Complete Zone 1 without getting killed by a frog even once.

Kill 10 large water serpents without losing a life.

Kill 4 orange centipedes without losing a life

Watch the entire credits without skipping.

Complete the game without buying anything from the shops.

Play Zone 3 all the way to the boss without letting a single enemy escape.

Trigger 7 mines via proximity without losing a life.

In Zone 4 ride a platform into lava.

Buy all weapon upgrades.

Buy all armor upgrades.

Complete the game with a bad ending on any difficulty.

Complete the game on Easy difficulty with a good ending.

Complete the game on Normal difficulty with a good ending.

Complete the game on Hardcore difficulty with a good ending.