How do we bring up a list of completed tasks??
I want to be able to review the completed tasks
On iOS, you can enter a project, scroll to the bottom of the list and tap on "Completed tasks" to see tasks completed in this project.
On the web, with Todoist Premium, you also get an option to view all completed tasks from all projects (through Karma -> View All Completed), sorted by date and time which you can filter by project and label and visualize your productivity.