Turn the sound down to 0 and music off in the options menu whilst in the library

Max out one Confidant.

Complete the Bank Palace.

Perform a Group Guillotine execution.

Complete the Museum Palace.

Obtain a Treasure Demon.

Complete the Castle Palace.

Exploit enemy weaknesses 100 times.

Obtain a Persona through negotiation.

Collected all of the Trophies

Use all the Minikit vehicles

Unlock all female heroes and villains. (Single Player Only)

Collect all the gold bricks (Single Player Only)