Just to expand the achievement system a little bit. Basically, it is all in the title.
If you don't want people seeing your achievements, you just need to click off allow full inspect.
Having achievements is an easy way for new players to understand the existance of Shadow Lairs / Danger Missions, not just because they are something to work for.
The developers are really good at making puns, so I bet that they should have an easy (and maybe fun) time coming up with achievement names for rabid snarb / ice queen / etc :)
I think this would be nice. I would finally get some bragging rights for my Dauntless Achieve.
And also because currently unless you are on Steam no one else can see your achievements.
And new achievements would be interesting.
+5