Beating Satan during the subquest The Great Adversary unlocksGodborn difficulty mode. This is essentially the game’s version of Ultra Hard mode with features that make it more challenging to complete. Shin Megami Tensei V: Vengeance Game Difficulty Guide Unlocks Lucifer for demon fusion by beatin...
In the middle of the Love Soupreme request, you’ll be asked to do the next request which requires battling personas. Defeat 10 mothmen using Sophia in the Arboretum tower area. When you’re done, report the progress to the guy near the Akagire shop and you’ll be able to buy tickets...