So far yes, and I bet other games are way harder than this, like the FEAR achievements that are just not worth it for the achievements, but the COD 2 ones are only few and are worth so much.
I have completed the last British Mission, got everything done... from Russian to the Last British Mission... but I have to complete Hill 300 andCrossing the Rhine. I had been one hell of a road to come pass by. If you don't believe it, check it out on this link at posted below.
http://live.xbox.com/en-US/profile/Achievements/ViewAchievementDetails.aspx?compareTo=Seraphic%20Dragon&tid=%09%5D:%60m/l4%06%04