These are all the corpses you have to cast "Discitea Mort" on in order to get the achievement. To get this achievement you have to do this in one play through.

Note: This achievement seems to be glitched. I had to go back and try a couple of times on some corpses before the achievement popped up. After casting "Discitea Mort" make sure not to skip the text too fast.

Mountains
You have to speak to this skeleton to continue the story:




















Dungeons
This body is back at the beginning of the game, in the first cell you can enter near the bottom of the map:




















Forest
You have to speak to all three bodies at the checkpoint:




















Desert
Speak to the corpse in the middle of the desert:




















Mansion
There are three bodies here to speak to in the mansion in three separate locations:

Use the spell on the grave.



















The corpse is in the basement:



















This body is under the bed in the main bedroom upstairs



















Shadowgate
There are three bodies here to speak to in Shadowgate in three separate locations:

Use the spell on the human body, not the shark.



















Use the spell on the cyclops.



















Use the spell on the body sitting on the throne.