there are 5 ending
1&2 are bad endings 3&5 are good endings and 4 is dlc ending
how to get them:
for ending 1 u don't trust grim on day 3
ending 2 u have to be mean to grim(annoy him or smt) and lose the deal
and for ending 5 joke about getting married
(i don't have the dlc so idk what ending 4 is about)
hope that helps!