I don't know, when I first saw the achievements section in the main menu it felt uncomfortable to me. ADOM is an old-school game, and having such a modern element added to it feels out of place. :-/ I don't like the idea of them in general either, usually they're there just to superficially add to the game's playtime without adding to the actual gameplay. I don't want the game to tell me that something I did was special because I got an achievement, I want to decide it myself.

Some kind of option to simply hide the achievement section so I needn't worry about its existence would be nice to have. On the other hand, it depends on the quality of the implemented achievements - the various challenge games are already a big ADOM tradition, so it would be kinda nice to have an official acknowledgement for completing one.