Fargrave Quest gives progress towards wrong Grand Adventurer achievement

Alchemical

What is says on the tin; I turned in the quest 'Robhir's Final Delivery' in Fargrave and suddenly got the achievement for Western Skyrim Grand Adventurer. My achievement progress towards Deadlands Grand Adventuerer is only at 3/14 despite already doing quite a few quests, so now I'm concerned more of them might be other quests misattributed to the wrong achievement.