>>545941078
Beat story chapter 14 and then do Second Affection side story.
Beat chapter 21 and then do Overzone and Red Ash in that order.
Wordless can be done around when you reach 25.
Beat 25 and then do Last Kingdom.
Mudfish side story and Unbreakable Sphere when you beat 38.

Not really sure if I should recommend doing Old Tales before or after 32
Same for Eden Spear. It starts around 25 and ends when you're at 39 but the game only warns you about 25.