NPPL PAINTBALL 09 BOOSTING 

There are Ranked Matches achievements in NPPL Paintball 09, but they can be easily done by boosting. You cannot invite friends, but you can search easily and find your friends randomly. There's not too many people online, so it is not too difficult to find your friends.

You will need however a minimum of FOUR players to start a match. It is also best that you search all at the same time.

MULTIPLAYER ACHIEVEMENTS  

Woodsball Chief - 50 points

Win at least 50 Woodsball Ranked Matches over Xbox LIVE

Speedball Chief - 50 points

Win at least 50 Speedball Ranked Matches over Xbox LIVE

Predator - 80 points

Make at least 200 eliminations in multiplayer matches