I played the crap out of this game when it came out. Never actually sought out avatar awards but ended up with a few.
I've since sold my HDD and this game, then recently bought the Undead Nightmare version of the game that comes with all the DLC on the disc and I'm using a USB drive for storage. So basically I have no prior saved game data and am starting an Undead Nightmare playthrough.
I've decided that I want the black on red RDR logo t-shirt for my avatar. I know it is found in a chest at Riley's Charge. My question is this, can I earn an avatar award during an Undead Nightmare playthrough or does it have to be a regular playthrough of the original game?