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!"
Completed "The American Dream"
Completed "Agatha's Song"
Completed "Reilly's Rangers"
Collected 20 Vault-Tec Bobbleheads
Completed "Finding the Garden of Eden"
Completed "Picking up the Trail"
Kill all the Super Mutant Behemoths
Completed "Strictly Business"
Completed "Stealing Independence"
Completed "Head of State"
Completed "Oasis"
Made one of every custom weapon
Completed "You Gotta Shoot 'Em in the Head"
Won 50 Speech Challenges
Completed "Trouble on the Homefront"
Completed "The Waters of Life"
Completed "Tranquility Lane"
Completed "Scientific Pursuits"
Completed "The Wasteland Survival Guide"
Completed "Those!"
Completed "The Replicated Man"
Completed "Galaxy News Radio"
Discovered 100 locations
Completed "Following in His Footsteps"
Hacked 50 terminals
Completed "The Nuka-Cola Challenge"
Completed "Tenpenny Tower"
Killed 300 people
Reached Level 20 with Neutral Karma
Reached Level 20 with Bad Karma
Reached Level 20 with Good Karma
Completed "The Superhuman Gambit"
Completed "Big Trouble to Big Town"
Completed "Blood Ties"
Collected 10 Vault-Tec Bobbleheads
Killed 300 creatures
Reached Level 14 with Neutral Karma
Reached Level 14 with Bad Karma
Reached Level 14 with Good Karma
Placed a grenade or mine while pickpocketing
Completed "Rescue from Paradise"
Picked 50 locks
Reached Level 8 with Good Karma
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 Good Karma
Reached Level 30 with Neutral Karma
Reached Level 30 with Bad 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"
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"
Found All 100 Steel Ingots
Completed "Into The Pitt"