What are the remaining parts of Islam if the acts of worship, such as fasting, prayer, and zakat, are part of two out of its sixty-two parts?

There is no Hadith with this wording. Rather, it has been authentically reported that the Prophet, peace and blessings be upon him, said: "Faith has seventy-odd or sixty-odd branches, the best of which is the saying 'There is no god but Allah,' and the least of which is removing a harmful object from the path." Narrated by Muslim. One can refer to Al-Bayhaqi's book "Shu'ab al-Iman" (Branches of Faith) or Ibn Hajar's abridgment to learn about these branches.