When you create a distribution, one of the options available via the Results tab is Target Release and Target Self-Reporting Options. This allows you to require that users complete a specific number of tasks before they can review their own results. This is typically used for peer assessments so that learners are required to provide feedback to others before they can see their own feedback. Please note that these settings are specific to a single distribution only. This tool does not require users to have completed a percentage of tasks across all distributions.