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