Despoiler of Byzantium

The Fourth Crusade speedrun: a Crusade against Byzantium must deviate into founding the Latin Empire, with you on the throne. Eligibility for the deviation event chain wants you to be the strongest Catholic leading the Crusade - so play a top-tier Catholic power (England, France, the HRE, Hungary) - or, alternatively, very high Martial lets you demand the lead when invited to the deviated Crusade. Win it, take the throne, collect the Despoiler of Byzantium trait and the achievement with it. Being in a winning Crusade, it also covers For the Faith! if you somehow still need it.