During Chapter One
after taking a ride with Docter Swansea and arriving at the Hospital, head left and you'll encounter two men fighting each other. Speak to the man that stays behind and he will rudely introduce himself as Clay. You'll be given two options during the upcoming tutorial to either EMBRACE
him. You'll need to embrace
Clay for this achievement and kill him.NOTE
: Be warned, killing Clay will cause the Merciful Release
and Not Even Once
achievements to be unobtainable so it's recommended that you create a back-up save.To get both, either disconnect your Xbox from the internet just before encountering Clay, then delete your save file, reconnect to the internet and have the cloud bring it back.. OR.. immediately after interacting with Clay, go back to the main menu and load your game again if it hasn't saved by this point.