Wizardry: Labyrinth of Lost Souls

Reveal 100% of Shiin's Dungeon. You should start working on this trophy from the very beginning. If you have a map, press to open the map screen (or if you don't have one use the spell "Arcane Map" Mages have which unfortunately gets disabled when you walk into an Anti-Spell-Zone). You need to map every single tile of the ten maps in Shiin's Dungeon. This will be much easier once you get the "Free Warp" spell in the next-to-last tier of the Mage category of spells. So you may want to wait until you get that ability to complete the final few tiles you are missing since it will allow you to warp anywhere as long as you've already mapped that tile. Also you will see a map with a little star symbol on it to the left of the floor name when you've completed mapping an entire floor.

The trophy will unlock after mapping the last tile of Shiin's Dungeon.

Here are the completed maps of that dungeon taken from the semi-Japanese guide on here (credits go to hshirako):

 

1F

 
2F

 
3F

 
4F

 
5F

 
6F

 
7F

 
8F

 
9F

 
10F