To view your full task history you can click on then View task history button above the task list.
From here you will be able to view a calendar chart showing all days you used forget.work and worked on tasks, with some information for each day.
You can hover over each day to view some high level stats and filter by year.
You can click on any day either in the chart or the list and it will take you to a page which displays analytics about your tasks on that day with a full list of them.
