Platinum Trophy

 is a Fallout 3 and Fallout: New Vegas trophy on PlayStation 3.

It is granted for collecting all other 50 trophies in each game.

Fallout 3 strategy
The easiest way to achieve this goal is to continue to work for it throughout your main playthrough.

Throughout the game, you will easily gain the Quest Trophies. There is no need to take any shortcuts, like finding your father early, as completing all of the quests will get you to level 20 quickly. The only problem is quests that go against your karma level, such as Strictly Business, so be ready to take a karma hit. Trophies such as One-Man Scouting Party, Keys are for Cowards, Silver Tongued Devil, Weaponsmith, and Data Miner will take just a small bit more work to obtain. If you don't intend on raising any of those particular skills, make sure to look out for as many locks and terminals as possible. Power plants are good choices, as they usually have one of each that you can break into. Speech challenges are very frequent, and you should still have an option to exit the dialogue and save if you need to gain multiple tries. You can also use the Knock Knock exploit. Also, it might sound wierd, but if you find a safe and a computer terminal you need to hack to open the safe, if you have a high enough level: pick the safe's lock first. This then means you get access to the safe and its interior, get an extra picked lock to add to your tally, and also you can then hack the terminal to add that as well. The Weapons are a little harder though, the schematics are all fairly easy to obtain, but you might need to make a few side trips to get all the parts.

For the karma trophies, it all depends on how you wish to play the game. If you intend to play as a good or neutral character, than avoid blowing up Megaton. You can gain some easy karma by donating to the church. You can make a save state when your around the required levels, and then donate all of your caps to the church. You will gain the trophy, and you can reload your normal save. On contrast, if your playing a good character, then you can easily make a save state, kill off a town or too, and then just reload. Just make sure to watch your experience, if your close to leveling up and your about to complete a quest, you might want to save just to be safe.

For Bobbleheads, it can definitely be difficult. Make sure you get the two (possibly three) Bobbleheads that you only have one chance to get. Grab the Medicine Bobblehead right before leaving for the G.O.A.T, or during Trouble on the Homefront. Pick up the Strength Bobble head from Lucas Simms' house if you plan on destroying Megaton, and take the Energy Weapons Bobblehead if you want to order Eden to destroy Raven Rock. For the rest, look at Bobblehead guides periodically, if you know you're close to a Bobblehead, check to see if you can spare the time and ammunition to go grab it. It will makes things a whole lot easier when you try to get them all.

Killing the Super Mutant Behemoths is surprisingly easier than it sounds. If you can spare the weight, carry a Fat Man with you all the time, and save the ammo for when you really need it. The Behemoths can take one or two mini nukes, and they are usually located in a place filled with NPC's bent on killing it. So a long as you have some spare Stimpaks, you should be fine.

The last few trophies require little to no effort at all. These trophies are Slayer of Beasts, Doesn't Play Well with Others, and Psychotic Prankster. Anyone can spare enough karma to slip one grenade into an unidentified wastelander, and you meet way more than 300 creatures and humans on your journey. If you need a little boost on your human kill count, just use the standard method of saving and mass murdering.