"Legend of the Wild West" achievement?

#1davhuitPosted 2/1/2009 9:35:05 AM
for the "Legend of the Wild West" achievements, where we need 300 kills
Do i have to complete the sessions for my frags to be recorded?
Because yesterday i was in a deathmach with 45 frags and suddenly the game says "this game session is no more available".
I wonder if i lost my frags anyone know?
I checked the leaderboard but i can't see my numbers of frags.