Here is the full list of all 38 Krzyżacy - there are The Knights of the Cross achievements.
Complete Starlight Guidance
Complete Will of the Sword
Complete Guide
Complete Poison that Helps
Complete Sea Breeze Blows
Complete Businessman
Complete Whisper of Hope
Complete Blooming Anemone
Complete King's Demeanor
Complete Encounter Guided by Stars
Complete Wish Comes True
Complete Great Inventor
Complete Miracle Arrow
Complete Iron will
Complete Knight and Rose
Complete Deadly Twin Tails
Complete Reliable Friendship
Complete Capricious Blessing
Complete War is Coming
Complete Final Battle of Grunwald
Complete Female Knight’s Growth
Complete Priceless Friendship
Complete Forest Child
Complete Holy Light Guardian
Complete Overwhelming Persuasion
Complete Good Luck Descends
Complete True Salvation
Complete Worldly Priest
Complete Sea of Knowledge
Complete Belief in Salvation
Complete Gentle Giant Axe
Complete Beauty and Beast
Complete Gentle Elder Sister
Complete Proven Innocence
Complete Knights and Oaths
Complete Guarding Wilno
Complete Challenge of the Strong
Complete Contacts and Shield