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