Today we will see whether Vishnu is the Supreme God or just one among the Trimurthis and also the meaning of the 138th Divya Nama of Vishnu Sahasranama कृताकृतः from:
लोकाध्यक्षः सुराध्यक्षो धर्माध्यक्षः कृताकृतः

In Vaishnavism, we identify the concept of Supreme God, Paramatma, with Vishnu. But in the concept of Trimurthis, we say that Vishnu is the god of protection and sustenance. Isn't this a bit confusing? Is he the Supreme God, or just one among the Trimurthis, responsible for protection?

Atharva Shikha Upanishad, Vishnu Purana, and the Tamil Saint Nammalvar offer an answer to this puzzle.

Vishnu IS the Supreme God. Vishnu among the Trimurthis is an incarnation of the Supreme God Vishnu carrying the same name. Brahma and Rudra were created by the Supreme God Vishnu to execute the functions of the creator and the annihilator. The Supreme God Vishnu himself incarnated as Vishnu the protector among the Trimurthis. So you should understand that Vishnu the protector is not different from Vishnu the Supreme God, but at the same time, Vishnu the protector is not equal to Vishnu the Supreme God. This is not some kind of inferiority. It only means that to carry out the protection of the universe, only a small percentage of the Supreme God is needed. Understanding Bhagavan's multifaceted nature can deepen your reverence and devotion. Knowing this truth, you should seek his guidance, protection, and blessings. You should do everything possible to be part of his role as the protector of divine order and divine will.

There are two kinds of dharma - Pravartaka dharma and Nivartaka dharma. Pravartaka dharma is karma that causes rebirths, both good and bad karma. Nivartaka karma ends the cycle of births. It is Bhagavan who gives the results of both these types of karma. He is कृतः when he gives the results of the Pravartaka type of karma and अकृतः when he gives results of Nivartaka karma. So Bhagavan is कृताकृतः.