The Roads to Power Add-on for Crusader Kings III has 20 achievements.
Complete Hassan-i Sabahs unique content by destroying an Empire
Have every camp followers temperament be positive and have at least 10 camp followers
Complete El Cid's unique content with the 'An Honorable Man' ending
As a Legitimist Adventurer, win a claim war for a Kingdom or Empire
Choose to set out on an Adventure as a spawned Historical Character
Choose a New Destiny 5 times in the same campaign
As Baudouin of Jerusalem in 1178, defeat Saladin in a war
As an Islamic Sultanate of Rum, adopt Administrative Government while owning Constantinople
Starting as a Count, rule an Empire, become an Adventurer, then rule an Empire again
As Princess Tamar, rule all of Georgia and fully Conquer Armenia and Daylam
Become the Emperor of a newly-formed Latin Empire through a Crusade
Become a Dominant Family within Byzantium
Adopt the Administrative Government via Decision
Starting in 1178, Re-Establish the Theodosian Borders
Upgrade your Estate with a lvl 5 Villa and fill all external slots
As a non-Powerful family, buy a Remit and successfully Raid the Estate of a Powerful Family
As Co-Emperor, rule a Despotate
Have five simultaneous House members as Theme governors (not including you) while not being the Emperor
In 1178, start as the Palaiologos and become Emperors of Byzantium
As an Adventurer, buy an Estate in Byzantium and lead your line to become Emperors