some contracts ask you to complete the sencondary objectives a number of times for a specific mission. the problem is often the mission/level you need to complete isnt on the mission board. if it is only 1/4 to 1/3 of the missions on the board even has a secondary objective to chances are it wont. and if it does there is a chance the other players in the game dont want to or wont make an effort of completing the secondary objective because the rewards for them are to low.