Full list of all 99 Crusaders of the Lost Idols achievements. It takes around 200 hours to unlock all of the achievements in the base game on Windows.
The base game contains 56 achievements, and there are 7 DLC packs containing 43 achievements.
Complete the 'The Final Battle' objective by beating area 550 in the 'Mischief at Mugwarts' campaign while your Crusaders are slowly picked off one by one.