Complete Mementos.

Hear 250 of Futaba's navigation lines.

Unlock all hangout spots.

Enter a special relationship with someone.

Obtain a Treasure Demon.

Defeat 3 or more enemies at once with a single round of bullets.

Successfully rescue a hostage from an enemy's threat.

Obtain 150 items from searchable objects in Palaces.

Perform a Gallows execution.

Complete the Museum Palace.

Defeat an enemy with a knife.

Complete "The 4th Survivor" extra mode.

Kill 3 enemies at once with a sub-weapon.