Would like to keep a record of our completed work.
Every Asana list—including your My Tasks list, and each list in teams and projects—has an option to export your tasks from each list as a
.csv spreadsheet file.
Open the list you want to export, click the drop-down arrow beside the list name, then select Export -> CSV to download a spreadsheet of every task in that list.
You can't export all of your lists at once, though, so you'll need to export each list individually.