Let's Get It On stat

You will have 2 different stats. Pure stats and custom stats. In game, goto community and then leaderboards. By default pure stats is listed. Click on server type to see custom stats displayed.

The most important thing is always, do not worry too much about stats. Sometimes it takes a while to update, so be patient. Just play and have fun and the stats will take care of themselves. It takes playing to raise your stats. The more you play, the faster your stats will increase and the faster your ranking will grow.

This is the achievement where you play a multiplayer match in each gametype isn't it. Your problem could be:
Playing on custom maps
Playing with a custom character (even if you have one installed)
A custom mutator

Can you get any of the game types completed for this achievement? Playing LAN games, I found that I could only get Betrayal and Warfare by hosting the game, although the other game types worked ok with me joining instead of hosting.