From the History screen, tap on the top card to view more details about your completed tasks.
The completed tasks card will summarize your adherence to the plan you have been assigned. Note, it does not count activities that are optional tasks in your pattern as part of your adherence.
To specific details about which tasks were or were not completed, you can simply tap on the day. This will navigate you back to the home screen to the specified day so that you can see the list of tasks which were completed or missed.
Then, simply scroll through the day to view the tasks that were completed and/or missed.