Here is the full list of all 43 King of Dragon Pass achievements.
Forge other clans into a tribe
Build every fortification
Give a clan a new name
End a feud
Complete the tutorial
Suffer a massive attack by the Beastfolk
Suffer a massive attack by the dragonewts and their kin
Suffer a massive attack by the Uroxi berserkers
Suffer a massive attack by the dwarfs
Suffer a massive attack by the trolls
Suffer a massive attack by the Telmori wolf-men
Succeed at every heroquest
Create a new clan by splitting
Find your way home after being lost in the Otherworld
Achieve Kallyr the Hero’s destiny
Discover the easter egg
Have a clan leader elected as tribal queen
Win the Ten Year Ring as tribal queen
Have a clan leader elected as tribal king
Win the Ten Year Ring as tribal king
Become Queen of Dragon Pass
Become King of Dragon Pass
Explore the map of Dragon Pass
Succeed at five cattle raids in a row
Succeed at ten cattle raids in a row
Succeed at five raids in a row
Succeed at ten raids in a row
Win five times
Win ten times
Win as a peace clan
Train big lizards as beasts of burden
Train big lizards as battle mounts
Have 25 points of clan magic
Select a Trickster to lead the clan
Hoard 25 treasures
Build a shrine to every deity
Learn every mystery
Earn the Ten Year Ring at the Hard level
Become King or Queen of Dragon Pass at the Hard level
Win a tribal war
Make peace with the trolls
Achieved Kallyr the Hero’s greater destiny
Achieved Theya’s destiny