During "The Plan", kill all of the enemies before entering the tower

Defeat Mundus' spawn

Acquire Aquila

Help Phineas retrieve his eye

Survive the encounter with the Tyrant in the church

Acquire the Angel Boost ability

Slay 100 Demons as Dante

Defeat Dante's pursuer

During "Found", kill 10 enemies using the Hurricane ride

Upgraded all of Sonic the Hedgehog's stats to their maximum levels

Complete all substories.

Cleared all hot dog stand missions in Apotos

Max out the level of a platinum hostess.