The contract was dead before it even started. Agent 47 stood in the rain outside a high-rise in Chicago, the ICA's voice—usually a calm, steady hum in his ear—replaced by the static of a burning bridge. Diana Burnwood was gone, and with her, the only leash 47 ever respected. To "unlock" the path forward, he didn't need a key; he needed to become a shadow again.
Here is the content regarding unlocking all missions in . hitman absolution all missions unlock
In , missions are primarily unlocked by completing the preceding chapter in the story mode. There are 20 main missions in total. Standard Unlock Method The contract was dead before it even started