I obviously can't speak for migrating from vBExperience, but I can tell you that you can both manually and automatically give out awards and achievements respectively in vBActivity.
Ours is also fully supported so any issues you encounter will be addressed ASAP (quicker by posting in our support forums vs here on vb.org)
There's currently no importer from vBExperience, but the Pro version has pre-made data available for import
Fillip