I had a N3DS, it was my first handheld and it was great! Really good selection of games. My most played were Monster Hunter Generations (which was my introduction to the series) and Fantasy Life - one of my absolute faves, a charming and colorful fantasy adventure with life sim elements. The story is a bit meh but the gameplay loop is incredibly satisfying and there’s nothing else quite like it. I’ve been replaying it on an emulator (rip Yuzu/Citra devs) recently and it’s still a blast.
Yeah, one of the only games I’ve 100%ed, the achievements are deliberately set up so that you can get most of them organically by the time you get to the true ending. The rarest achievement on Steam has like a 6% obtainment rate, which is a lot.