Achievement is stressful only if you assume it to be. Ambition creates anxiety only when you are overly attached to the results.
Achievement is something you do. It is not who you are.

If you fail to attain the results you seek, that does not make you any less of a person. Certainly your aim is to be successful, yet it is much more effective to choose success than to need it.

Expect the best, and give your very best to the effort. Then be willing to accept the results, whatever they may be.

Care intensely about what you intend and what you do. But don't worry or obsess about what you get.

Your most effective efforts come from who you are, not from what you need. Let go of your attachment to the results, and you'll get the best ones ever.