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