I thought the same thing and that I should need to use a guide but Amira's Info tells you exactly what you need to do and what order to do it in. Simply note that when she tells you things, she lists it in order from easiest to hardest.Im pretty worried in Chaos route since it's free roam, im afraid of missing out on stuff because I've done something that should've bene done later, so I want to ask, if we progress through Amira's info alone, will it be sufficient to cover the entire route, or some quests/area need some "info gathering" in order to appear?
Amira will explain everything you need to do for the route as well as what the intended progression order to do it is. As long as you follow her directions you should have a relatively smooth progression without running into enemies 10x stronger than your current party or missing anything important.