I've added a rather natty new page to the site which should make it easy for you to see which achievements you can earn that will boost your TrueAchievements or GamerScore.
Once you've logged in, go to the Main pages menu item and select "My achievements". This will bring up a list of all the achievements you have, the game you got them in and the TA score and ratio you got for them. You can even sort the achievements by clicking on the column headings. All good so far, but that's not the really cool part...
By clicking on the "Achievements I don't have in games I own" option, you will bring up a list of, well, Achievements you haven't won yet in games you've got (predictably). If you then sort this by TA Ratio, you'll find a list of the easiest achievements to get with the lowest ratio (for some GamerScore boosting), or click the TA Ratio again to see the hardest ones to get. Or click on the Score header to see the ones that will give you the biggest boost to your TA Score - nice!
And if there's a solution available for the achievement, they'll be a little icon for you to click on to view the guide - sweet!
I've also added some functionality to allow you to set up your leaderboards as "by request" - this means you will receive an email when someone wants to join it and it's up to you whether you let them!
Have a good one