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