The Ragnarök Add-on for Titan Quest Anniversary Edition has 12 achievements.
Finish the main storyline
Find new friends
Open the ancient gate
Acquire the mistletoe
Journey north of the Alps
Beat Legendary difficulty as a Rune Mastery character
Improve a legendary item
Have 10 enemies immobilized at the same time
Find Andvari's lost treasure
Have ten different class characters of at least level ten