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