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