Dungeons & Dragons: Chronicles of Mystara

Simply complete "Shadow Over Mystara".

The game consists of 10 levels, the levels themselves contain several different paths / scenes.

Its suggested to do a playthrough with each character and take as many different paths as possible to help in finding the bulk of the items for:

and then mop up the random specific items that can only be obtained in certain areas/ certain characters.

Can be done on any difficulty, not difficult in the fact that you can continue as many times as you wish. Also, if you can't complete it in one sitting, don't fret, there is a level select so you can continue from the last level you were on.