- Complete all Dead Money quests
- Complete all 12 out of 14 non-recurring Dead Money challenges
- Collect the fully modded weapons from Dead Money: Bear trap fist, Automatic rifle and Holorifle (3 mods) and craftable weapons Knife spear clean, Cosmic knife clean and Cosmic knife super-heated
Armor and Clothing
- Collect armor and clothing unique to the Sierra Madre:
- All 3 companion training perks in Dead Money: Coin Operator, Ghost Hunter and Sierra Madre Martini
- Choose Elijah's Last Words (for Veronica) or Elijah's Ramblings (for the player)
- All 37 Gold bars (optional due to requiring exploits)
- Skillbooks - Read all 13 in Dead Money.
- Snow globe - Sierra Madre
- Unique/hard to find but useless items:
By completing the above, all Steam/Xbox Live/PS3 achievements will be achieved along the way.
I will add to this list as things occur to me. Feel free to suggest more additions in the comments below.