Harry Potter: Quidditch Champions

The Everyone Starts at the Beginning at Hogwarts achievement does not need to be done in an online match.

In order to unlock this achievement, all you need to do is win one Quidditch match. Unfortunately, the matches played in the tutorial (The Weasley Burrow Garden Cup) do not count for this achievement. The first match I played in the Hogwarts Quidditch House Cup is what did it for me. This Cup is unlocked as soon as you complete the tutorial levels, and you don’t have to win the whole Cup, just one match. If the difficulty is too hard, you can always restart the Cup and choose a lower difficulty to make it easier to win.

Although it is not the path I took, I would imagine that playing and winning an online match should also count for this achievement.

I hope this helps!