The Northern Lords Add-on for Crusader Kings III has 10 achievements.
As a Norse-Asatru ruler, have your capital on any island in the Indian Ocean
As an Asatru, hold all of the original Thessalonika, and any empire title other than Byzantium
As an unreformed tribal, form the North Sea Empire
As a North Germanic Asatru, control all islands in the Atlantic and the Mediterranean, whilst keeping your realm size below a certain threshold
As a Norse tribal, control the entirety of Sicily
Form a coven as a female Asatru witch
As any one dynasty, commission a hundred rune stones
As a Christian North Germanic, participate in the very first crusade from the start
As a North Germanic or Asatru ruler, convert to Islam & convert all of Russia
As a dwarf, win a Varangian Adventurer war anywhere outside of Europe