jphil03 said:The Business Is War achievement in Syndicate worth 138 pointsComplete all chapters which track difficulty, on hard difficulty No this does not need a main storyline flag as you only have to complete certain chapters within the game, not the whole story line.
That does not mean it is not Main Storyline
The achievement will definitely unlock while playing through the game on hard, therefore it is Main Storyline.
I've flagged all 3 achievements as suggested, thank you for the submission N0 Scope!!