Alexander was a coppersmith. Paul did not specify the evil he did.

Source: 2^nd Timothy 2:14

Demetrius opposed Paul in Ephesus due to Paul threatening his occupation. What was his occupation?

Demetrius was a silversmith who made and sold shrines of the Goddess Diana.

Source: Acts 19:24-41

What trade did Aquila and Priscilla have in addition to church planting?

They were tent-makers Paul had the same trade and worked with them.

Source: Acts 18:2-3

Peter was staying with a man called Simon when the fried of Cornelius came. What did Simon do?

Simon was a tanner he lived in the city of Joppa.

Source: Acts 9:43