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