need hard nightmare achievments

well omd2 is like omd1 missing some hard nightmare achievments; so why is there no achievment for 5 skull every nightmare map? ... and im missing achievments for the dlcs :>
its just like .. jus play through the story at nightmare and the game starts to feel pretty much completed, because u may have 100% achievments at this time
would be awesome to have some realy hard to reach achievments in omd3 (hope omd3 is comming :>)