Rolling Ammo Master Trophy in Uncharted 3: Drake's Deception

This trophy is really quite easy and can be done in almost every chapter where there are armed enemies. In order to pick up ammo while rolling, you must be facing a dropped weapon and press to perform a roll. Before the sequence of the roll is complete, tap to pick up the ammo. The trick to this trophy is to find a dropped weapon in an open space and ensure that you are not already armed with it, for example this will not work if you roll over an AK whilst you already have one. Once you find one, simply carry out 20 rolls over the weapon, picking it up every time and switching out your current gun for the one on the floor. There are a ton of places you can get this, normally after a huge gunfight where the environment is littered with guns.

In Chapter 6 - The Château, you will climb out from underground to appear at the top of a well outside the Château where you can stealth kill the guy right in front of you. Lay waste to the bad guys in the grounds surrounding the well until everyone is done for. There will be .45 Defenders, Sawn-Off's, AKs and a Micro as well. Run around until you come across a dropped gun you aren't already carrying in an open space and perform your moves until the trophy unlocks.