Select "Unlock Menu" at the "Options" menu. Then, enter one of the following codes to activate the corresponding cheat function.

Elite challenges
Press Y, Up, X, LT, RT, A.

Stronger Protego Totalum charm
Press Y, B, Up, Left, RT, Right to strengthen your Protego Totalum charm so that nothing can get through it.

Super strength potions
Press X, Left, Right, A, RT, RB.