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There's not one instance in the Book of Acts or in the Epistles of an Apostle remitting the sins of anyone.

First of all, let's be clear. The Catholic Church does NOT claim that any human being other than Our Lord has the power to forgive sins. Rather, more precisely, the Catholic Church forgives sins IN THE NAME OF JESUS CHRIST, which is what Christ told His Disciples (and by implication their successor) to do.

So, in a certain says, no Apostle remits the sins of anyone anywhere in Scripture, but this is a straw man argument, because this is not in fact what the Catholic Church claims to do. Again, the Church forgives sins IN THE NAME OF JESUS CHRIST.

However, with that clarification made, here is a verse from Acts, aside from the Gospel verses I references earlier, which validate Catholic teaching on the sacrament of Confession.

Acts 2:38
And Peter said to them, "Repent, and be baptized every one of your in the name of Jesus Christ for the forgiveness of your sins; and you shall receive the gift of the Holy Spirit.’"

“Again, the Church forgives sins IN THE NAME OF JESUS CHRIST.”

Christ doesn’t need any help to forgive sins.

What is it that forgives sins?