Challenges

Challenges can be completed by achieving the goal outlined in the description. Completed challenges grant mastery.

Bugs

 * Some challenges that were completed prior to update 11 are impossible to achieve for now (e.g. Pole Weapon Proficiency and probably the rank related challenges). This seems to be fixed in 11.1.3
 * "Saviour of Jupiter" and "Saviour of Neptune" are currently unable to be completed due to a bug not allowing them to complete when their respective bosses are defeated. (As of Update 13.7 this is no long true, you can and many people have had success in completing these challenges. However "Savior of Earth" is no longer able to be completed.)