Goals should be about balance. If we are "under" achievers or "over" achievers we are not achievers at all, or if we are doing something for the wrong reasons, then we really didn't accomplish much. We should strive to achieve balance and "be reasonable" about goals and deadlines and lists.
It is good to have ambition, determination, motivation, but not if it is at a cost to something more important like happiness. A goal should not rob us of our peace. If you find it hard to relax, like myself, and fill your life up with work, let me tell you from experience, it only makes you restless.
Why? Because there is always more work. You will never be satisfied because there are always reasons (aka excuses) to bury oneself in work. It might be your way of coping with something, of staying busy, or avoiding something else. Whatever the reason, work doesn't give you answers.
The goal in this situation is to search for hobbies. Something that brings peace and joy and isn't done for the sake of being productive. Leisure is being productive by reminding us that work is a means to an end, whereas true "rest" is an end in itself because it parallels eternal rest. Our greatest work will be union with God and loving prayer to Him.