Full list of all 15 Inferno 2+ achievements worth 1,000 gamerscore. It takes around 1-2 hours to unlock all of the achievements on Xbox One.
Complete Level 20
Destroy 25 Shielded Enemies
Fire 500 Missile Shots
Max Out All Missile Ammo
Upgrade Every Missile Simultaneously
Maximize The Upgrades on a Weapon
Apply a Double Enhancement
Upgrade Every Weapon Simultaneously
Complete 1 Secret Level
Use a Power 5 Times
Get Destroyed 5 Times
Reach 1,000 XP
Destroy 10 Item Orbs
Destroy 1,000 Enemies
Collect 10000 Gold - Total