I'm having trouble releasing the trophy in question, I've completed the local five and nothing of the trophy and the suit. I do not want to start NG +.
Hi MitszxD! I apologize for the delay in response. For this achievement, it appears to be related to The Curse of the Pharaohs. You had to complete each of the 5 Serqet locations. If you have, try these XB steps for achievement issues.