Became a partner in a Deep Roads expedition.
This is missable. For this achievement, you must pay Bartrand 50 sovereigns to join the Deep Roads expedition. This may require additional exploring and doing side quests to obtain. The "Friends in Low Places" side quest becomes available through a letter in Gamlen's house if you have completed 50% of the quests in Act I. If you come across this quest do not accept Dougal’s loan because you will not get this achievement.