Everyone likes to feel congratulated for their hard work - even when it's in a video game.
Earning a unique skin or achievement makes you feel like you've accomplished something that many have not - and since PlayStation, Xbox and Steam all now show you what percentage of players have gotten certain trophies, you can now literally see when that's the case.
And you should be especially proud if you grab an achievement that it turns out that a very small minority possess. Not only because you're now kind of part of an elusive club, but also because these achievements are either hard as nails, require surreal things, or are just huge time sinks - or sometimes all three, if you're really unlucky.
Regardless of what difficulties you faced to get this achievement, one thing is sure: you can rest easy in the knowledge you have a very strange sort of bragging rights for the rest of your life.
Sure, some people may not understand why you put so much of your free time in Bomberman or NBA 2k18 - but as they say, an artist is never understood in their time.