クックニアの邪悪な強敵 Trophy in VVVtunia
How to unlock クックニアの邪悪な強敵[The Wicked Formidable Foe of Cooknia]
[Defeated the formidable foe of Cooknia.]
For this trophy, you must clear the endboss of Cooknia a second time. Notably, the boss will be stronger than it was last time and will have a different color scheme. At this point, you should be able to do this immediately after killing the boss for the first time as the increase in power should not be as staggering at this point.