Albion Unconquered:
* Start in the Stamford Bridge bookmark as Harold Godwinson
* Harold Godwinson, Harald Hardrada, William the Bastard, and Svend II are all dead
* k_england was not, at any point, held by Harald Hardrada, William the Bastard, or Svend II
* Steam description: From the Stamford Bridge start, protect the kingdom of England from all invaders as Harold Godwinson
The second condition was the best I could come up with for determining that all of the potential invasions of England had been thwarted and that none of them would come up with some crazy second wind.
Heresiarch:
* As an independent liege following a heresy of any religion in which the parent religion has at least 50 counties (to avoid anything like Messalian cheese), have your heresy become the new orthodoxy of its religion.
* Must hold at least 50% of provinces of the heresy-turned-orthodoxy at the time of the flip.
I just think this is a better name for this particular achievement than the previous suggested name for it.
A House Divided Against Itself:
* As an emperor, have at least three vassal kings of your dynasty, all with different religions and cultures than yourself and each other.
Poland Can Into Space (CK 2 edition):
* Hold k_poland OR
* Hold e_wendish_empire with Polish culture
* Have all tech levels advanced to level 8 in your capital
* AND have an average realm tech level of 5 in every technology
Yes, this is based on both the meme and the EU IV achievement of the same name
Can't Touch This:
* Start with the dynasty Hammer (eg. Count of Bornholm)
* Have the largest realm on the world by holding count
True Paradoxian:
* Start in the Stamford Bridge start
* Land all of the members of the PDS staff in the game (most if not all can be found in Stenkil Stenkiling's court, IIRC)
