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