I also had this dilemma but try phoning tonya for the pulling favors missions and there are a couple of S&F missions that didn't unlock for me until finished the main story or I collected everything (all the letters) and there is that kiflom achievement that counts for about 5-6 missions, good luck
ASSASSIN'S CREED,BIOSHOCK,CALL OF DUTY2,CALL OF DUTY4,CONDEMNED, CRACKDOWN,FIGHT NIGHT3, GRAW2,
HARRY POTTER OOTP,HITMAN:BLOOD MONEY,KING KONG, LEGO STAR WARS II,
LEGO STAR WARS TCS, MASS EFFECT, OBLIVION,TEST DRIVE UNLIMITED,TIMESHIFT,TOMB RAIDER:LEGEND,VIVA PINTA
GAUNTLET,GOLDEN AXE, PORTAL: STILL ALIVE,UNO
Last edited by Original Jet Li; 10-20-2013 at 10:16 PM.