To buy so many rewards, Tris Prior had to get as many aspiration points as possible. The overall strategy was 1) aim for the faster aspirations to complete (e.g., Friend of the World vs. the music one), 2) have other household members "assist" with completing aspirations where possible, and 3) sequence the order in which aspiration milestones were undertaken
The set upTris started out by moving into good ole bargain bend and adopted a child. The child was aged up to an adult, and both Tris and Child 1 adopted three more children in anticipation of Big Happy Family. All but one were aged up to adults, and were eventually all added to a club.
How household members assistedHousehold members could indirectly assist with the completion of aspirations in a couple of ways. If they reached L10 of a mentor-able skill, they could mentor Tris. They also helped raise money for the completion of the two wealth aspirations through craftables (which Tris sold). Finally, they helped collect things that would be useful for later aspirations (for example, on Day 1, the whole family was sent to the Oasis Springs Park. Two children were sent off to mine/collect stuff from the rocks, 4 children fished at the back pond until they got a cowplant berry (necessary for the last milestone of Freelance botonist); 1 child caught frogs (the second milestone of the Curator); and Tris introduced herself to ten sims (first milestone of Friend of the World)
SequencingI won't go into every detail, but Tris completed aspirations that would not be assisted by a bonus trait (e.g., Creative Visionary) first, such as the Curator and the family related aspirations. There were also some aspiration milestones that made sense to complete before others - for example, during Serial Romantic - Tris made friends with the 8 boy/girlfriends (which also doubled for Friend of the World), and once she had Great Kisser, she also maximized charisma (also Friend of the World and a bunch of other aspirations). In short, the goal was to complete aspirations first that could be used to help other aspirations later.
Completed AspirationsTris fully completed 10 aspirations (Painter Extraordinaire, Chief of Mischief, Fabulously Wealthy, Mansion Baron, Serial Romantic, Soulmate, The Curator, Leader of the Pack, Friend of the World, Party Animal), and reached the final milestone of 5 others (Master Chef, Successful Lineage, Big Happy Family, Nerd Brain, Freelance Botonist), and had partial completion of a handful of others
The other seven simsYou'll just have to wait for Part II