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