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