On this page of the guide to Aliens: Fireteam Elite you will learn whether there are daily tasks in the game, and if so, what do they offer.
Yes, Aliens: Fireteam Elite does feature daily and even weekly tasks. Depending on the rarity of the task, you will most often have to complete two daily tasks, which will change the next day, and one weekly task, marked in purple.
Each task offers two currencies, the quantity of which may vary depending on the completed task. For daily tasks, it will be 800 Requisition Credits, 60 Rep Scrips and a pack that can contain various weapon add-ons or even new challenge cards.
These tasks are worth doing because they are a very simple method to quickly get more in-game money. They are primarily worth doing specifically for the packs, which can contain many interesting items.