Here is the full list of all 18 Death Coming achievements.
Discovered by Angels for 10 times
Waken Werewolf, Dinosaur, Vampire and Pharaoh in the Museum Stage.
Kill the Matron of the Villa area
Complete a 10-combo kill
Complete a 5-combo kill
Kill the FIRST person during Reaper work.
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
Trigger the Incident of Alien Robot during the Massacre.
Accumulated 5 vases missed
Kill 50 Thieves in Bonus 2.
Kill the 8 starred characters in Act 7 and trigger the curtain call.