I've also noted the requirement to unlock each, so beware: SPOILERS AHEAD!
Anyway, here's what I have come up with:
* Sommelier
You know a good drop when you taste it
[Wine Glass/v0.4 barrel]
--> Tasting the wine from all 3 barrels in the cellar
* Conversationalist
None may escape your silver tongue
[Dlgedit icon]
--> Talking to all NPCs during one play through
* Keeper of secrets
Embarrassing confessions are safe with you
[Sealed scroll]
--> Not telling Talan's secret to Jelom
* Revealer of truth
Under your vigilant eye, no wrongdoing stays hidden
[Eye? Light?]
--> Telling Talan's secret to Jelom
* Trusty servant
As always, you keep your mistress out of harms way
[Main character portrait]
--> Finishing the game
* Yetin acolyte
You walk the way of the yetin spirit
["Hi-Res" pic of midget yeti]
--> Getting Frostbloom to talk on first try
* Gem-bearer
What is thought to be lost, you already discovered
[Catseye]
--> Presenting the gem to Erek during the first conversation with him
* Master detective
Your inquisitive powers lead you to the right conclusions
[Spy glass]
--> Presenting all the right conclusions in the final dialogue
* Paragon of virtue
Neither lie nor deceit parts your lips
[Ankh/Exult icon]
--> Always being honest and open (i.e. never hiding your connection to Silverhair and the location where you found the gem. Telling Jelom the truth about Talan and not promising Lucia to cover him up.)
The list is roughly sorted by difficulty, and if there are any additions I'd rather have them near the end of the list, as there are already 5 fairly simple ones.
Anyway, further ideas, comments and corrections welcome!
Kai