Feathers in is a common phrase used to describe an accomplishment or success that one can take pride in. However, there are numerous other synonyms that can be used interchangeably to convey the same meaning. For instance, the phrase "pat on the back" is often used to describe a job well done. Similarly, "gold star" or "blue ribbon" can be used to emphasize a specific accomplishment. In addition, the phrase "kudos" is also used to acknowledge someone's success or achievement. Overall, using synonyms for "feathers in" adds variety and enhances the language for expressing appreciation and recognition.