There are a maximum of 29 Aarklash: Legacy achievements worth 709
111 tracked gamers have this game, 7 have completed it (6.31%)
Start a new game in Rag'narok level of difficulty; then reach and kill Baron Mornstar without ever pausing the game. Make sure you disable the tutorial and the automatic pause options.
Unlocked by 12 tracked gamers (11% - TSA Ratio = 3.04)