Here is the full list of all 51 The Sims 3 trophies - there are 34 bronze, 15 silver, 1 gold and 1 platinum.
Unlock all other Trophies.
Design and save 20 styles using Create a Style.
Extinguish a Sim on fire.
Start 5 romantic relationships.
Get an insurance check for over §15,000 after using the Firestorm Karma Power.
Build a home of at least §350,000 property value on a large lot.
Resurrect a Sim.
Complete a Lifetime Wish before becoming a Young Adult.
Become a public menace.
Prepare a perfect meal.
Complete 150 Challenges.
Get engaged.
Become best friends with your boss and all of your co-workers.
Welcome a child into the family.
Use the Epic Fail Karma Power on 13 unsuspecting sims not in your family.
Attend a town event.
Throw an awesome party.
Complete 100 Challenges.
Complete 1,000 Wishes.
Write a book.
Catch a perfect fish.
Buy out a commercial property in town.
Unlock every Good Karma Power by purchasing them with Challenge Points.
Gain 250,000 Lifetime Happiness on one Sim.
Complete 50 Challenges.
Raise your household's value to §35,000 or more.
Explore the catacombs after dark.
Go on a date.
Move into a new home.
Experience the Meta.
Reach level 5 in a career.
Gain 150,000 Lifetime Happiness Points on one Sim.
Grow a perfect plant.
Complete any 10 Skill Journal Milestones.
Become a partner of the Paragon Personal Private Charity Warehouse.
Make a best friend.
Complete a Lifetime Wish.
Complete 10 Opportunities.
Complete 100 Wishes.
Reach level 10 in a Skill.
Complete any 2 Skill Journal Milestones.
Have a first kiss.
Get 5 positive moodlets at the same time on one Sim.
Buy a car.
Complete 10 Wishes.
Reach the maximum potential Karma.
Learn the Charisma Skill.
Make Woo Hoo.
Use a Karma Power.
Complete the in-game tutorial.
Create a household.