There are a maximum of 29 Aarklash: Legacy achievements worth 718
127 tracked gamers have this game, 8 have completed it (6.30%)
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 13 tracked gamers (10% - TSA Ratio = 3.12)