It depends on which security profile you have. Employees or CORE users with the HR profile can view their own HR information only. You are able to see your reviews, even if they are not marked as completed. This security profile provides read-only access.
Typically, you should also have access to the Time & Expense features besides CORE HR so that the employees can request time off in addition to making time and expense entries. If you want them to have full access to all CORE HR features, you should have the HR security profile instead.