Soul Hackers 2

This achievement unlocks when you defeat Takeminakata in the first floor (1F) of Arrow's Soul Matrix as part of the main story and the follow-up cutscene plays out. It is weak to Fire and Force attacks, so demons sporting these attacks in their moveset should be prioritized to build out the most of your turn-finishing Sabbath attacks. When its health depletes close to the midway point, two Chironnupu will be deployed in support. They are also weak to Fire as well as Electric attacks. Turn attention to taking them out when they appear to again max out the most of your Sabbaths.

I would recommend having three demons that hold either Fire or Force attacks and the last sporting an Electric one. My lineup went like this:

Pixie (Zio/Electric)-Ringo
Mokoi (Agi/Fire)-Arrow
Onmoraki (Agi/Fire)-Milady
Cironnupu (Zan/Force)-Saizo

Another perk with Pixie is her Dia healing spell, so keep it handy in case one of your party members takes a hard hit from Takeminakata's Electric attacks.

Credit to Wolf Knight at Samurai Gamers for the guide: https://samurai-gamers.com/soul-hackers-2/arrow-soul-matrix-...