[jNkk]

If you have a register system (else this wouldn't work):

pawn Код:

if(PlayerInfo[playerid][pKills] == 10) { //your code ... 
// you can add PlayerInfo[playerid][pKills]++; so you don't get bugs like leveling up each time you log in if you have 10 kills or whatever... just saying
if(PlayerInfo[playerid][pKills] = 500) { // your code ..

And repeat. Look up Kush's tutorial on how to make a DIALOG ACCOUNT SYSTEM.
It will help you out.