halo 3 achievement help?

[-)skullker8-X]

the one that u have to get 15000 pts on covenant i got like 20000 an still nun help

 

[Joe]

Did you make sure the points are selected "Free for All"? You can't earn all the points together.

 

[will]

you have to get 50000 on the covenant the best way to do it is to do it on normal mode and put on the following skulls tough luck,catch,fog,famine and cowbell