% Completion

Hi racheljeska 

Not sure if I understand your requirement correctly. If you want to display the % Completion result in a separate visual like a Card visual, you can create a measure like below, then add it to the Card visual. 

% completion =
DIVIDE (
    CALCULATE (
        COUNT ( 'Table'[Employee ID] ),
        'Table'[Completion Status] = "Completed"
    ),
    CALCULATE (
        COUNT ( 'Table'[Employee ID] ),
        'Table'[Completion Status] IN { "Completed", "Overdue" }
    )
)

And in the Data pane, select this measure, go to Measure tools ribbon to format it as Percentage. 

Best Regards,
Jing
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