Full list of all 52 First Feudal achievements.
The base game contains 46 achievements, and there is 1 DLC pack containing 6 achievements.
Build 5 bronze knights and win a fight (Ironman mode)
Help to get up to another player
Win an economic victory (Ironman mode)
Win a military victory (Ironman mode)
Win a scientific victory (Ironman mode)
Obtain all three types of victory (Ironman mode)