How to Make a Video Game - Step Two : Make a List

I'm starting my full time project, with some of the project already done. I made a list of MUST-HAVES for ANY 3d adventure game. There are even MUST-HAVES that i did not include on this list. All the things have to be programmed by just me of course. No big deal. Lots of stuff on the internet to help me. Here's my list in case you're interested.

The stuff i already have:

• Animated Models
• Multi-Instance drawing of Models
• Basic projectiles
• Basic Collision detection
• Basic Terrain manager

Stuff I NEED now:

• Sky Box
• Octree Implementation
• Particle Engine
• Post Processing System
• Controller Action Management
• Heads Up Display
• N.P.C. (none player characters)
• Frustum Culling
• Advanced Collision Handling
• Implement Sound Effects Game Component
• Billboard Component
• Pick Ups
• Mouse Picking
• Game State Management
• Menu System
• XML Data writing
• Game Process Saving
• Convert Project to XNA 3.1 (so far, every XNA update has been a little rough to install)