We'll, most likely it's the last map of the last expansion, so it's supposed to be a challenge. I played on extreme difficulty and had to try several times to achieve the chain of objectives before time ran out (at turn 30). The best thing you can do is make (mental) notes of the order of things. First assignment is easy to focus on but if you know what's coming next, you're going to be one step ahead. E.g. if you know you'll have to spend time producing something, get your cities ready with production exploitations.
Side note, if your secret tech is Celestian, trying to research the doctrine that repels marauders a.s.a.p. will serve you well on this map, otherwise, build up your colony defenses!