I love doing achievements and the harry potter games are really easy to get achievements in. Even though it only took 3 days to get all of the achievements, it was difficult for some of them.
for the "challenges" achievements you need to get past different themes of the game in a short period of time. sometimes the people who are with you get in the way and slow you down. also many times throughout the game you have to time your spell casting just right to get through the level. Sometimes what you press on the controller doesn't register and you end up dying.
Other than those things it was an OK game and entertaining.