Direct answer
Objectives follow journal display order. Some depend on your choices; follow the active objective in the game.
Result
Though Geralt had plenty of other worries, he had not forgotten about his trade - which is, let I remind you, slaying monsters. While striving to practice his profession he came across a contract offering an altogether attractive sum in return for tracking down a certain missing individual. No mention of monsters, true, but Geralt had seen enough incidents of its like to suspect one might turn up - and besides, when it comes down to it, coin is coin...
