After the previous game I completed, I thought it could be accomplished with either 3 or maybe 2 sims, so I did a couple of experiments, and then started over.
Rowan Delaney and her wife Raisha had 7 children together before Raisha popped her clogs (and narrowly missed having an 8th because of my fondness for playing on speed 3.) The delayed aging from those pregnancies gave Rowan enough time to complete all the requirements for the challenge on her own.
Her only pregnancies were those with her co-founder, and none of the children moved out before their YA stages (or the grand, great-grand or great-great-grandchildren.)
No Tech skills Fishing, Charisma, Parenting, Singing, Comedy
No Tech completed Spring 1, Day 24
Low Tech skills Cooking, Gardening, Violin, Guitar, Fitness
Low Tech aspirations Angling Ace, Serial Romantic, Soulmate, The Curator, Friend of the World
Low Tech completed Summer 1, Day 13
Mid Tech skills Handiness, Flower Arranging, Herbalism, Mischief, Painting
Mid Tech aspirations Freelance Botanist, Bodybuilder, Painter Extraordinaire, Outdoor Enthusiast, Fabulously Wealthy
Mid Tech completed Summer 1, Day 28
By the end of Mid Tech she was 9 days away from becoming an elder, but decided to become a vampire instead.
More Tech was very slow, but she had plenty of time.
More Tech skills Vampire Lore, Piano, Pipe Organ, Mixology, Logic
More Tech aspirations Archaeology Scholar, Master Vampire, Vampire Family, Jungle Explorer, Musical Genius
More Tech careers Entertainer (Musician), Criminal (Boss), Athlete (Bodybuilder), Gardener (Flower Arranger), Painter (Master of the Real)
More Tech completed Autumn 2, Day 4
Rowan was cured of her little undead problem and went back to the start of the Adult stage as a result, before tackling High Tech. She was a 5 star celebrity but hadn't spent any fame points, of course.
High Tech skills Acting, Dancing, Rocket Science, Video Gaming, Programming
High Tech aspirations Leader of the Pack, World-Famous Celebrity, Renaissance Sim, Nerd Brain, Mansion Baron
High Tech careers Culinary (Mixologist), Tech Guru (Start-up), Actor, Scientist, Social Media (Public relations)
Rowan reached the top of her final career on Summer 3, Day 5. She was 12 days away from becoming an elder.
So the final score is 1, 0, 0, 0, 0.
As always I have a ton of save files and my spreadsheet lists the completion day for every skill, aspiration and career, as well as birth days etc.