Complete a specific mission objective in "The Gang’s All Here"

Complete Enemy Territory

Use 15 enemies as human shields

Complete a specific mission objective in "The River Deep" in Local Co-op mode

Complete the game on the hardest difficulty

Complete Salvation

Complete a specific mission objective in "Over and Out"

Complete half the game on hardest difficulty

Complete Last Resort

Complete the game on any difficulty level

Complete a specific mission objective in "Whiteout" in Local Co-op mode

Complete Outside Contact

Complete Chapter 5 on any difficulty level