Own all cleaning liquids at the same time

Rescued the Bot in Thrust or Bust.

Battle Gná

Battle King Hrólf

Adopt a pet

Unlock the Hideout

Perform 5 assassinations in a row without being noticed or entering combat

Perform your first Finisher as Yasuke

And that was just a beginning...

Complete 9 Mastery Quests

Acquire more than 15,000 Fleeting Echoes on a single attempt

Reclaim Pandora's Statue