Full list of all 73 Fallout 3 trophies - 41 bronze, 24 silver, 7 gold and 1 platinum.
The base game contains 51 trophies, and there are 5 DLC packs containing 22 trophies.
Collect all other 50 Trophies for this Trophy
Collected 20 Vault-Tec Bobbleheads
Won 50 Speech Challenges
Kill all the Super Mutant Behemoths
Reached Level 20 with Bad Karma
Reached Level 20 with Neutral Karma
Reached Level 14 with Bad Karma
Reached Level 14 with Neutral Karma
Reached Level 8 with Neutral Karma
Completed "The Nuka-Cola Challenge"
Completed "Strictly Business"
Reached Level 8 with Bad Karma
Hacked 50 terminals
Made one of every custom weapon
Completed "Agatha's Song"
Completed "Stealing Independence"
Killed 300 people
Discovered 100 locations
Completed "Trouble on the Homefront"
Reached Level 20 with Good Karma
Collected 10 Vault-Tec Bobbleheads
Placed a grenade or mine while pickpocketing
Completed "The Wasteland Survival Guide"
Completed "Oasis"
Picked 50 locks
Completed "Head of State"
Completed "Those!"
Completed "Reilly's Rangers"
Completed "You Gotta Shoot 'Em in the Head"
Completed "The Superhuman Gambit"
Completed "Take it Back!"
Completed "The American Dream"
Completed "Finding the Garden of Eden"
Reached Level 14 with Good Karma
Completed "Picking up the Trail"
Completed "Rescue from Paradise"
Completed "The Waters of Life"
Completed "Tranquility Lane"
Completed "Scientific Pursuits"
Killed 300 creatures
Completed "Tenpenny Tower"
Completed "The Replicated Man"
Reached Level 8 with Good Karma
Completed "Big Trouble to Big Town"
Completed "The Power of the Atom"
Completed "Galaxy News Radio"
Completed "Following in His Footsteps"
Completed "Blood Ties"
Completed "Escape!"
Took the G.O.A.T.
Got the Pip-Boy 3000
Completed "Death from Above"
Completed "Shock Value"
Completed "Who Dares Wins"
Reached Level 30 with Bad Karma
Reached Level 30 with Neutral Karma
Reached Level 30 with Good Karma
Completed "Not of This World"
Completed "Among the Stars"
Completed "This Galaxy Ain't Big Enough…"
Collected all Alien Captive Recordings
Completed "Aiding the Outcasts"
Completed "The Guns of Anchorage"
Completed "Paving the Way"
Completed "Operation: Anchorage!"
Completed "The Local Flavor"
Completed "Walking With Spirits"
Completed "A Meeting of the Minds"
Discovered all locations within Point Lookout
Completed "Into The Pitt"
Completed "Unsafe Working Conditions"
Completed "Free Labor"
Found All 100 Steel Ingots