If you complete the indicated mission, you will unlock the corresponding bonus:
Auric Goldfinger multi-player skin: mission 2 on the hard difficulty
Bore Tunnel multi-player level: mission 1 on the hard difficulty
Dr. No multi-player skin: mission 5 on the hard difficulty
Goldeneye multi-player skin: missions on the easy difficulty
MRI Vision: mission 1 on the normal difficulty
OddJob multi-player skin: mission 1 on the hard difficulty
Omen XR: mission 6 on the hard difficulty
Venom 200mL: Auric Enterprises mission on the normal difficulty
Xenia Onatopp multi-player skin: mission 4 on the normal difficulty