I'm pretty sure there are more quests. I don't want to ask you about specific stuff because the Suramar storyline is cool enough the first time through that I'd hate to spoil it. I don't remember what all counts as "main storyline" quests for purposes of the achievement but until you hit the quest that literally walks you up to the Nighthold entrance there are definitely more quests.
About the first minute after I switch to any other character from my DH I find myself trying to double-jump or glide. It's not just you.