Acts 15:12:

Then all the multitude kept silence, and gave audience to Barnabas and Paul, declaring what miracles and wonders God had wrought among the Gentiles by them.

Notes on Acts 15:12:

Not all the miracles done by the apostles are listed in Acts.  In this case, we just know God worked miracles and wonders through Paul and Barnabas.  As is always the case, it was God doing the works through them, not Paul and Barnabas doing the works in their own strength.  It is a relief to know that you do not have to “perform” or work something up.  You just have to be available for God to use you.