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The Task List Report allows an admin user to see the Tasks that a user has outstanding, but it is not possible to run a report currently to see a list of Tasks that have been completed.
For more detail on what's changing check out this article.
But, we've now completed the first part of this development (we've rewritten tasks and are now working on Calendars & Events) so why not Register your interest to get involved as an Early Adopter and give us your feedback on these major product enhancements.
If you're interested to know a little more about what we've got planned, then check out this article: https://docs.prospect365.com/en/articles/9027673-activities-tasks-events-are-changing