Meet the conditions below to meet the requirements needed for the named challenge.
(Note that this refers to the Challenges on Page 2: the 88 on Page 1 of the menu are those you can accept from the menu and go immediately into a specialized situation for the challenge. These must also be completed during the main story mode.)
Successfully complete the game under the Normal difficulty setting.
Defeat the Bosses in the following order unlock and use the corresponding attack with the next Boss.
There are two challenge types. Type 1 are like mini-stages or boss battles and are accessed from the Challenge Menu. Type 2 are like Xbox's Achievements and don't need to be unlocked to do them. Type 1 boss and miniboss challenges generally require reaching the corresponding boss on the corresponding difficulty mode (the challenge is unlocked when you reach the boss, not when you kill it).
Beat the game or stage to unlock the specific weapon, item, or mode.
In Challenge Mode, some challenges are marked ???? by default to access them, you must meet the following conditions in Story Mode.