I'm near the end of the game, but some achievements that should have triggered by now, haven't. Obvious examples:

1) used melody on Sand Ghost;
2) used melody on Leaper (only the Jesterwood/melody achievement registered);
3) and, I think, the Mage-specific one for Cassia. I have all the mage special skills, even the 2 I didn't use (heavy armor), and a # of spells capped @ 4th level.
4) a few others I think but can't remember right now.

I'm playing w/ the latest, patched game 2.1 (2.2??), on a Mac (that shouldn't matter).

On my 2nd playthrough, I'm wondering if the game doesn't like to give multiple achievements per battle map.

Escaping Niobe's guards, I wore no armor, bore no weapons. But I only got the achievement for No Weapons.

Couldn't even get the No Armor achievement for a single battle. Cassia had no armor, including even a belt. Nada.

Unless the achievement requires all party member to wear no armor, which is a bit much, but if so, it should say that.

I just think the achievement is broken.

Got the No Armor achievement. It did require the entire party of 4 to have no armor, including belts.

Still some broken achievements re: melodies used on the Sand Ghost & Leaper.

And some achievements, if not broken, are amazingly difficult/obtuse (e.g., The Monster).

B/c I'm stubborn, and the game is relatively short, I keep plugging away at these (4th game). I've got the Master of X (all 4 of them, melody related) achievements, but there are still some amazingly difficult/obtuse (The Monster or The Saint) achievements I no longer care about.