Here is the full list of all 26 Silmaris: Dice Kingdom achievements.
The valley is under control
At least 3 wars before turn 15
No war before turn 25
5 artefacts in chest
Reach 15 Fate points
No besiege suffered before turn 30
Make all city improvements
10 adventure missions accomplished
First ally or vassal city before turn 7
Trade with all cities
Smuggling in all cities
All the cities are conquered by force
All the cities are joined by diplomacy
All kings and queens are overthrown