Only silly people flaunt achievements. I use them as a meta-gaming guideline, which in a good game leads to interesting and fun challenges. In an RPG, it’s like a check box for getting every ultimate weapon, fighting every boss, etc.
Can also give me something to do in a game I’ve played but loved. Retroachevements for instance encouraged me replay SaGa (aka Final Fantasy Legend) with only one character in the team. Wasn’t too hard, but definitely a second playthrough thing.