Guild Wars 2

I completed this path today for the first time, received the standard ’You’ve done a dungeon path’ reward, but no specific ’You’ve done this path for the first time’ reward. Also, my achievements panel is not showing the path as completed. I have now completed the path for a second time and still no achievement.
Screenshot attached shows missing achievement at completion of path.

try a different path, it is a bug where the completed tick is against the wrong path, you just have to find the path it should be. or just wait until there is a fix for it.