Brahmā addressed Lord Kṛṣṇa as Acyuta because the Lord is never forgetful of a little service rendered by His devotee. He is so kind and affectionate towards His devotees that a little service by them is accepted by Him as a great deal. Brahmā has certainly rendered much service to the Lord. As the supreme personality in charge of this particular universe, he is, without a doubt, a faithful servant of Kṛṣṇa; therefore he could appease Kṛṣṇa.
HINDU GODS CHART There are four main sects within Hinduism: 1. Shaivism (in which Shiva is worshipped as the main god); 2. Vaishnavism (in which Vishnu worshipped as the main god); 3. Shaktism (in which the female aspects of god are primarily worshipped); and 4. Smartism (in which six main gods are worshipped: Shiva, Vishnu, Shakti, Ganesh, Murugan and Surya).
"You are the original lamp. Other incarnations may possess the same candle power as the original lamp but the original lamp is the beginning of all light." ~Lord Brahma, in "Prayers Offered by Lord Brahma to Lord Krishna" ..*