Add the save game file to your save game location, change the name file if needed to not overwrite your own, make a copy of your own, just in case. Kill the last boss to get determiner of fate achievement.
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Played it with dlc's not sure it has ant impact. A save game file before the last boss. NG+ played 4 times on the same difficulty. Character level 193. Kill the last boss to get determiner of fate achievement. Eos vestiges collected, but not used, might be possible to restore them for the true ending as well.
Hope it helps someone else who's also pissed not getting the achievement after 3 playthroughs.