feather in one's cap

Etymology
The placing of a feather in a hat has been a symbol of achievement that has arisen in several cultures, apparently independently. The English writer and traveller Richard Hansard recorded it in his Description of Hungary, 1599:

"It hath been an antient custom among them [Hungarians] that none should wear a fether but he who had killed a Turk, to whom onlie yt was lawful to shew the number of his slaine enemys by the number of fethers in his cappe."

The Native American tradition of adding a feather to the head-dress of any warrior who performed a brave act is well known.

Noun

 * 1)  An accomplishment; particularly one that is flaunted or boasted of.
 * He thinks it is quite a feather in his cap that he figured it out for himself.
 * He thinks it is quite a feather in his cap that he figured it out for himself.
 * He thinks it is quite a feather in his cap that he figured it out for himself.
 * He thinks it is quite a feather in his cap that he figured it out for himself.
 * He thinks it is quite a feather in his cap that he figured it out for himself.

Translations

 * Finnish: sulka hatussa
 * French: ,
 * Icelandic: afrek, lofsvert framtak, rós í hnappagat einhvers
 * Norwegian:
 * Bokmål:
 * Nynorsk: ei fjør i hatten
 * Spanish: triunfo personal
 * Swedish:
 * Telugu: కీర్తికిరీటంలో కలికితురాయి