Reptile Displacement: Kill the Ancient Croc.
Seemed to bug out on me today. Killed him after Anatol and did not get any credit but did get lightning round credit for killing Anatol at least an hour into mission.
Either the credit is bugged and croc kill gives lightning
or
less than 30 mins is from spawn not mission start and Croc credit is bugged.
Ill try killing Croc before Anatol next time.