yes there is,if there is a stat editing code prob then theres gotta be a code to do will challenges,but it wont be an instant unlock all,itll be somthin like 30 challenges,depends on how much file size is.heres what i did find tho.
Player_unlockchallenge0 a "test code here"
player_unlockchallenge0b "test code here"
player_unlockchallenge0c "test code here"
player_unlockchallenge0d "test code here"
player_unlockchallenges "test code here"
so what do i put in the test code her part? the name of the challenge?