Achievements dont work on Project Cartographer. If you want achievements, you need to install Halo 2 w/ a product key (Therefore buying the game)
Un-installing Project Cartographer is easy, just delete Xlive.dll in Halo 2's install directory.
What's your control scheme?
MK or controller?
If its controller, then button combos would be easy to execute (B = B, X = X and so on lol)
If your on MK, then the button combos will be different in regards to execution.