Here is the full list of all 18 Death Coming achievements.
Kill the Matron of the Villa area
Complete a 5-combo kill
Kill the FIRST person during Reaper work.
Complete a 10-combo kill
Clear all Acts
Achieve the highest rating in all Acts
Kill all the marked characters
Spotted all Death Traps in every Stage
Successfully launch the missile in Act 2
Kill all passengers on the train in Snow Mountain Stage.
Trigger the gorilla plot at the Pier
Waken Werewolf, Dinosaur, Vampire and Pharaoh in the Museum Stage.
Trigger the Incident of Alien Robot during the Massacre.
Accumulated 5 vases missed
Discovered by Angels for 10 times
Kill 50 Thieves in Bonus 2.
Kill the 8 starred characters in Act 7 and trigger the curtain call.