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