Judas acted out of his own free will. Jesus said he was a devil.
(John 6:70-71 NIV) Then Jesus replied, "Have I not chosen you, the Twelve? Yet one of you is a devil!" {71} (He meant Judas, the son of Simon Iscariot, who, though one of the Twelve, was later to betray him.)
He also stole money from Jesus.
(John 12:4-6 NIV) But one of his disciples, Judas Iscariot, who was later to betray him, objected, {5} "Why wasn't this perfume sold and the money given to the poor? It was worth a year's wages." {6} He did not say this because he cared about the poor but because he was a thief; as keeper of the money bag, he used to help himself to what was put into it.
Judas never called Jesus "Lord". He always called him "rabbi" or "teacher".
(Matthew 26:49 NIV) Going at once to Jesus, Judas said, "Greetings, Rabbi!" and kissed him.
Judas betrayed Jesus for 30 pieces of silver, the price of a slave. It was prophesied:
(Zechariah 11:12-13 NIV) I told them, "If you think it best, give me my pay; but if not, keep it." So they paid me thirty pieces of silver. {13} And the LORD said to me, "Throw it to the potter"--the handsome price at which they priced me! So I took the thirty pieces of silver and threw them into the house of the LORD to the potter.
(Matthew 27:9-10 NIV) Then what was spoken by Jeremiah the prophet was fulfilled: "They took the thirty silver coins, the price set on him by the people of Israel, {10} and they used them to buy the potter's field, as the Lord commanded me."