Persona 5 Royal

This achievement ties to the bosses of the Spaceport palace, consisting of a gauntlet of battles with robot minions you faced throughout your exploration of the palace, then an all-new gigantic robot boss decked in a black tuxedo, and eventually you'll face the cognitive version of Haru Okumura and of course the cognitive version of her father himself when all is said and done,

Your party should consist of besides Joker that of Makoto, Morgana, and last but not least the real world Haru. Makoto's Nuclear attacks target the weakness affinity for the red-colored robots, and she also sports a Flash Bomb attack where any damage that inflicts Critical status offers you an extra turn, and you can use these opportunities to perform additional attacks. Morgana and Haru have Wind and Psychic attacks targeting all foes, both elements that the minions hold weakness affinities. When the weakness is first exploited, make sure to perform a Baton Pass, as the recipient will possess added buff to their attack stat and make clearing these robot waves all the more easier. Knowing these aspects will be critical to success, since you not only have just 30 minutes to prevail, but you must also eliminate all the robots in each wave (meaning not even one can flee) so as to progress to the end.

The first wave of robots are blue in color, and are weak to Wind. Morgana and Joker should help you make quick work of this lot. The next wave will be yellow, and is weak to both Psychic and Ice elements. Remember too that you have elemental attack items you can use for any character that doesn't have any skills that target all the robots' weaknesses in their repertoire, if you really want to max out every Baton Pass opportunity possible. The next wave are the red robots, and aside from the aforementioned Nuke weakness, they are also weak to Electric skills. At this point you'll discover the HP banks for each wave get bigger and bigger, and in this third wave the robots will have 1000 HP, but if you've mastered the art of Baton Pass, you will get through without much trouble, if any. The fourth wave are taller robots. blue in color, and weak to both Wind and Bless skillsets. You should have Wind (Air Cannon) and Bless (Happy Bomb) attack items in your inventory from your treasure chest discoveries from both exploring previous Palaces in addition to the Spaceport as well as Mementos. The fifth and final minion wave are bulky in shape, donning green business suits, and are weak to Psy. This is the wave that players find most frustrating of this whole shebang. The good news is if you've mastered the strategy for Baton Passes, you can eliminate all four of the green robots within the two turn window before they begin to flee. Just know to have the Psychic Bomb attack item in your inventory handy. Using an attack stat buff spell for Joker on his initial turn and saving his strongest moves for when you Baton Pass to him is a great strategy here, and in any of the preceding waves too, for that matter. Now you face the black tuxedo giant robot boss. While he has no weakness affinities, there's another way you can still earn a Baton Pass opportunity, and that's through hitting an attack that incurs Technical status while your enemy has a status ailment. On your first opportunity, use the Stun Gun item, and then use your strongest Physical attack skill (not your base attack, so that you don't have the Shock status transferred to you and you end up losing a turn being unable to do anything), and you can rinse and repeat with Makoto, Morgana and/or Joker. If you're concerned regarding opposing attacks, there is one charge-up and followthrough move called the Big Bang Challenge, an Almighty-type attack going after your entire party with heavy damage and the opportunity to impose Hunger status, significantly lowering your attack. The irony worth noting though, is if any of your party members already have Hunger status, it'll just absorb the damage, fully heal you, and your Hunger status is gone. So if you happen to have any party member that's Hunger afflicted and a defensive stat buffing spell and/or Mediarama, use it on one party member or the whole party during the one turn window that the opponent is charging (Big Bang Order), and have healthy party members Guard.

With all the robots defeated, you now come to the penultimate fight of this gauntlet, that being the cognitive form of Haru. Like the black tuxedo robot, she has no weakness affinities, but this time doesn't have any moves besides basic physical attacks. Attack her however you wish, but prepare for when her father gives the Sacrifice Order for her to Self-Destruct, which will come when you've brought down her HP heart to over 60% filled. Smart money is having anyone with a Mediarama spell heal your party, and everyone else Guard. And now you'll have only CEO Okumura left, and it'll be a laugher for a ceremonious triumph, which will be accomplished in just one move, because that's all you'll need to finish him!

Your achievement will come when you progress to 10/11, the date that would've called for Haru's marriage proposal to be made to another wealthy family's son, but after raiding and acquiring the Spaceport palace treasure, her father will call this proposal off, and also call for a press conference confessing of the toxic workplace culture imposed on all the subsidiaries run under his company, including that of Big Bang Burger. Once that happens, the achievement will pop on-screen!