Okay, didn't quite get this achievement at first, since i met the requirements and it didn't unlock, but dont worry the fix is simple.
so firstly what you have to do is get any character to level 11 to unlock the 2nd tier feats for that specific character.
Once you get level 11 go to the heroes menu and select that character
go to customize
and hit RB for the abilities tab
go to feats and change all of them to the 2nd tier of feats
keep hitting b until you get to the hero roster screen.
Note.
the reason it didnt unlock for me the first time is because i changed my feats back without confirming the changes. going back to the hero roster screen solves this.