Castaway Paradise
38 Achievements
Money in the bank!
Make a profit of 2000 gems at the Bank
13.2%
How to unlock the Money in the bank! achievement in Castaway Paradise - Definitive Guide
The actual requirement to get this is simply to 2 the "Big Bucks" bank investment which costs 5000 to do, and you get 6000 back. Do it twice and the achievement will pop.
This will take at least 48 hours to do if playing legitimately but about 10 minutes if you use other means.
When you go into Town Hall, there are three persons you can talk to: Sandy (Mail Lady), Ramona (Bank Teller) and Gordon (Stock Broker). You need Ramona for this trophy.
When you talk to her, you will have the option to put a portion of your coins into a "savings account" that will accumulate interest over a period of time. If you invest in the top account, you will pay 5,000 coins and be rewarded with 6,000 after 24 hours, a profit of 1,000 so to earn 2,000, you will need to do this twice. If playing legitimately, you will need to invest, wait 24 hours, cash out, invest, wait 24 hours and cash out again.
Alternatively, you can use the date/time settings trick mentioned in the Roadmap to make this trophy go much, much faster.