We have many ways of measuring achievement.  The measure can be aligned with the objective directly or peripheral factors.  Also it can be highly objective or subjective or somewhere in between.

For example if you are  playing a game of golf the measure could be your score or it could be your score against the scores of others.  Both of these are pretty objective measures.

However, it could be how you feel.  This is a more subjective measure not necessarily related to your score but rather how much fun you had.   Did your level of enjoyment meet expectations?

Measuring your Daily Activities

Most of us spend our days performing  activities involving mental or physical effort, i.e., work.  (To clarify financial compensation is not required to classify  spending your time as work).

What is the success measure relative to this work.  Like the golf game, there are multiple measures.  You can objectively assess if the goal of your activity was achieved and to what level.

The subjective measure of accomplishment can also apply.  Was it a good outcome, high quality, appreciated, etc.?

However, Over the long term, I would argue, the subjective measure of enjoyment and happiness is the most important.

If you are laughing and having fun the lack of more concrete success, while not desirable or to be encouraged, can be overlooked and absorbed to some extent.

This is not to propose that achieving what you set out to do is not important, but it should not be at the expense of your personal happiness.