The list of Days of Obligation includes all Sundays. Some feasts, like Easter, are always celebrated on Sundays, so they are always obligatory.
HOLY DAYS OF OBLIGATION 2024
Monday, January 1 - Solemnity of Mary, Mother of God
Thursday, May 9 - Solemnity of the Ascension of the Lord
Thursday, August 15 - Solemnity of the Assumption of the Blessed Virgin Mary
Friday, November 1 - Solemnity of All Saints
Wednesday, December 25 - Solemnity of the Nativity of Our Lord Jesus Christ
*As the Solemnity of the Immaculate Conception of the Blessed Virgin Mary falls on the Second Sunday of Advent, there is no obligation attached to the Solemnity.