Harry Potter and the Deathly Hallows - Part 1

This trophy sounds really tough, but it actually is not too bad to achieve. I found the last Hard Challenge (the silent sneaking one where you have to sneak to the Ministry of Magic toilets) to be the easiest one to do to get this trophy.

Just play it and be careful not to bump into anybody. When you enter under the columns just after crossing the street, a woman will be there with her back turned to you. Hide in the corner behind and to the left of the woman and take off your cloak with . Use the spell wheel ( hold and ) and select Confundo. Hit the woman with the spell (aim with and cast with ).

Immediately put your invisibility cloak back on and go past the woman, through the narrow tunnel into the courtyard. Go near where the Death Eaters are standing guard, and sneak behind them into another short tunnel. Turn right and continue in the middle of the street. Then, simply go down the stairs into the bathroom to complete the challenge! Be fast though, as it must be done in under 45 seconds.