Big Blue Blob in 1.13.0 acc0. I had to face a civil war for my queen, but it was well worth it. I didn't know that joining the HRE would make me a Duchy. Terrible mistake, but it was the first time I joined the HRE in this patch.
I tried really hard to get the inheritance of all Burgundy, but after doing the achievement I realised that it was unnecessary. I could've done it simply by taking more Russian territory and/or Livonian Order. Another option would be Ireland.
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