For great justice

• The Prophecy of Loki's Return
• Sven's Dreams of Doom
  • Ymir
  • Demons under Kiev
• Finish deciphering Zmei Gromovoi's Journal
• Defeat Isidor
  • Defeat Zarren and the Circle of Shadows
• Contact Minister Narek about forming an alliance against Jahan Mirza
• Decipher Zmei Gromovoi's Journal

For fun and profit

General

• Geryon
• Summon a chaos ooze, in order to generate planar artifacts
• Loot Ileana's boudoir and any lairs, vaults, or other stashes of wealth beyond what she had on her person
  • Find out where such lairs/vaults are, if any
  • Ileana's boudoir is in Chernovsky's cube, which is a problem

Vasily

• Seek out the Rilmani; learn about the "One Mind"; figure out how to impersonate one of them

Albrecht

• Get some wishes, become stronger, etc.