Find at least one of each collectible item

Wait for the game to resume after the credits

Capture the Ausmerzer

Max a perk

Get a new body

Find Area 52

Fully upgrade a weapon

Stop the Nazi signal from Section F

Perform a takedown while in the wheelchair

Complete The Final Countdown in Campaign on any difficulty.

Complete Break on Through in Campaign on any difficulty.

Kill 25 enemies with the AC-130 while defending the rooftop in End of the Line.