Use every available toilet in South Park and achieve the highest mastery level for each

Cut down bamboo in the bamboo forest.

Spot the flock of wild geese at dusk.

Solve all decoder boxes.

Win a power struggle with a demon.

Strike a demon with Kaede's Special Attack.

Use Magic Jewels to increase Magic Power to maximum.

Enhance all swords to maximum.

Unlock Kaede's alternate outfit.

Collect all files.

Obtain all armor for Samanosuke.

Complete the game and get an S Rank.