Here is the full list of all 31 RPG World - there are Action RPG Maker achievements.
Looted 500 Items
Equipped a legendary item in every slot
Killed 1000 Enemies
Looted 100 items
Created 100 worlds
Created 50 worlds
Placed 1000 items down
Placed 500 items down
Looted 50 items
Equipped an epic item or above in every slot
Equipped a rare item or above in every slot
Created 25 worlds
Killed 500 Enemies
Created 10 worlds
Played All Knight Subclasses
Killed Wraith Master Boss
Killed Skeleton King Boss
Killed Orc Chieftain Boss
Killed 100 Enemies
Placed 100 items down
Killed 10 Enemies
Created 5 worlds
Looted a legendary item
Looted an epic item
Looted your first item
Killed Death Knight Boss
Shared 20 times on Workshop
Shared 10 times on Workshop
Shared 5 times on Workshop
Shared a game on Workshop
You created your first world!