I've played LEGO Harry Potter: Years 1-4 through to the end. I've got most of the trophies, but not all. I think I've done everything required to get them but it just won't give the the trophy and I can't see how to trigger it.
The Student Rescue trophy should be granted when all students in peril are rescued. The game is stating I've found 50 of 50 but hasn't given me the trophy.
The Dark Wizards trophy says I have to buy every version of Voldemort - I've got 167/167 characters and have bought everyone at Madam Malkin's. Am I missing something?
I've been into Borgin and Burkes and got the last Lord Voldemort character - but to get that I had to find/earn all 200 gold bricks.
I've seen some walkthoughs that suggest there may be glitches that stop you being able to achieve all the achievements. One recommended taking a back up of your save game regularly - but I haven't, I didn't realise till too late as I didn't look up the walkthoughs till I was stuck.
Have I really got a start a new game and play it through again if I want the above two trophies (and the True Wizard that would follow)? That means replaying it entirely to get all the Dark Wizards (Lord Voldemort after 200 gold bricks!).