"The client wants us to provide a behavioral analysis trends on transactions over a 6 months period."
This is way too vague and broad to be able to come up with any meaningful specification. Typically there are three aspects to AML. These are money laundering, financing terrorism and sanctions. You need to get clarification and more detail from the client regarding what subject area(s) they want to focus on and what types of account behaviour they want to monitor. No doubt you need to have regard to the AML laws and regulations of the client's country. Start by googling what these are so you have a better understanding what AML issues are relevant.
