Super Gamer Dude
Unlockable: New Game+
To unlock a New Game+ option, beat the game once through and save after the ending and credits have concluded. You can then play through the game again with your items, gear, Materia, and more from your previous quest.
Unlockable: Item Fusion Tome
To unlock the Item Fusion Tome, complete mission 7-2-1.
Correction from DJ JD
Unlockable: Genji Armor
Acquiring the Genji Armor requires you to complete your DMW gallery and to achieve 100% for each piece of the gallery. Genji Armor allows your max HP to reach 99,999, adding permanent Endure and Regen to Zack for as long as the gear is equipped.
Unlockable: Genji Shield
The Genji Shield is an extremely powerful piece of gear that’s located in Mission 7-6-6. You have to fight the Magic Pot using the following attacks in this order: Gil Toss, Costly Punch, 99,999 Damage and Octaslash. The Genji Shield, when equipped, gives you permanent Omni Status Guard, absorbs elemental damage and keeps permanently active Barrier and MBarrier.
Unlockable: Genji Helm
You can acquire the Genji Helm in the Network Shop Shade, a shop that can be found on mission 9-5-4. It costs a million Gil, it equips No Cost MP and No Cost AP, and adds a permanent Libra affect.
Unlockable: New Game++
To unlock a New Game++ option, beat the game with a New Game+ file and save after the ending and credits have concluded. You can then play through the game again with your items, gear, Materia, and more from your previous quest.