Here is the full list of all 27 Star Dynasties achievements.
Fully acquire a bloodline upgrades branch
Have 3 of your children be wards of foreign rulers simultaneously
Design a family of 16 characters
Win the game
Have a league of 30 systems
Press a claim
Complete 20 turns in one game
Have an affair
Have 10 house members assigned to a task
Have a baron swear allegiance to you
Complete 10 turns in one game
Have a league of 15 systems
Host a feast in someone's honor
Have a duke swear allegiance to you
Trigger your first expedition event
Win a tournament
Conquer your first system
Win a battle
Have all places in your council filled
Complete the tutorial
Repair your first installation
Have 250 money
Assign a house member to a task
Customize your character
Have all house scores above 200
Raise a child from birth and have them come of age with a skill greater than 50
Have a foreign ruler inherit your house