Spreading the love is NOT missable and can be obtained in online co-op. You simply play the bank robbery scenario. Put ALL your men in the vault, then wait for the cops to enter said vault... make sure you've got 5, then throw your fire bomb. Achievement unlocked.
For I have sworn thee fair, and thought thee bright
Who art as black as hell, as dark as night.
Stand still and consider the wondrous works of Valentino Rossi.