Instead of getting side quests through NPCs, Chained Echoes has a reward board accessible through the main menu under Journal -> Reward Board, alternatively by pressing L2 / LT / L key while running around.
The reward board displays common tasks found in RPGs and gives you rewards in return. When you enter a new area, the tasks for that area are unlocked on the reward board automatically.
A task shows you its location, what you need to do and the rewards you get for them.⠀
Once you finish a task, the respective task is marked with a red dot on the board.
You can then select it and claim the reward for it.
If at least two completed tasks are adjacent to each other horizontally and vertically, they will form a reward chain. The longest chain you currently have is displayed on the bottom left.
Additionally to the task rewards, you get rewarded for making your reward chain longer. You can access the Chain Rewards with the “View Chain Rewards” button.