It Takes a Thief to Catch a Thief Trophy in Moonlighter
It Takes a Thief to Catch a Thief
Earn money from the Banker 5 times
How to unlock It Takes a Thief to Catch a Thief
It seems the counter for this resets when you exit the game and/or does not track properly. The work around is to do this all in one session.
You will need to purchase the Banker town upgrade from the bulletin board in the village for 70,000 gold. You will be unable to purchase this town upgrade until you have beat the Forest Dungeon and also have purchased the third shop upgrade.
Once purchased, the Banker will be available during the day. Talk to him and invest any amount of gold. When you return to him on a different day, he will either show you a gain or loss on your investment. When you are shown a gain in your investment, cash out to receive your money you've invested, plus the profit. Do this five times to unlock the trophy.