I just finished the expansion and am still missing the "Idolater" achievement. I have explored each map, spoke to every person (most of em three times) and done all quests I found (a lot) except for the one with the monk in Thule Abbey that wants a dagger of somethingamabob - because I already sold that thing at the time I met him.

Brought the Idol of Balbus to Dolf, found an Idol of Ice and an Idol of Fire (both of which my char still carries around) and can't remember any more idols.

Now my question is - anybody out there that knows how to get that achievement? Did I miss one and how to use fire and ice? Maybe I just missed a sign to read with a hint on it...

Anyways - great game!