The process is as follows: Since Metamask handles Erc-20 tokens, navigate to Etherscan, the blockchain explorer for Ethereum transactions, and paste your wallet address in the search column. A page comes up that displays all transactions handled on that wallet address. Scroll past those transactions to the bottom of the page. Click on ‘Download CSV Export’ and enter the parameters as required. Click download and you’ll get a statement containing all your transactions for the specified period.