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You need to fulfill the requirements for all endings in one playthrough in order to unlock the True end, and those include the Chims' end and Wealth end. True end has the highest priority, so once unlocked, it will override all other endings.
I have a video on all the endings and how to get them (spoiler alert, obviously): https://youtu.be/X3CgyEA_8O0
Video description below:
There are 10 endings in this game determined by events and flags. To get an ending, you need to trigger all of its flags while avoiding others, as each ending has a specific priority (in descending order: True, characters, Chims, Wealth, Normal).
Please note I have omitted most of the events that trigger automatically, otherwise each section would be several pages long (and Mimi's already is).