Here is the full list of all 20 ROGUS - there are Kingdom of The Lost Souls achievements.
Your sword randomly hits a monster after you have been killed
Retrieve your teleportation stone
Go back to the shadows
You know you can't resist it
Kill 50 monsters with your sword
Kill 200 monsters with your sword
Turn into a rat 10 times using "Wheel-O-Cheese"
Fly for 3 minutes using "Feather of the Dreamer"
Die 25 times
Get a highscore of 1000
Get a highscore of 5000
Strike a monster with "Hiraikom" while using "Feather of The Dreamer"
Turn into a tree 10 times using "Apple of Rage"
Kill 25 monsters using "Apple of Rage"
Kill 25 monsters using "Acheronian Sword"
Kill 25 monsters using "Hiraikom Legendary Beer"
Kill 25 monsters using "Reaper Chili Pepper"
Kill 50 monsters using "Reaper Chili Pepper"
Kill 100 monsters using "Reaper Chili Pepper"
Block 50 monsters' magic fire with your shield