Full list of all 15 Inferno 2+ achievements worth 1,000 gamerscore. It takes around 0-1 hour to unlock all of the achievements on Xbox One.
All achievements
Achievements they've won
Achievements they've not won
Complete 1 Secret Level
Maximize The Upgrades on a Weapon
Get Destroyed 5 Times
Use a Power 5 Times
Complete Level 20
Destroy 25 Shielded Enemies
Max Out All Missile Ammo
Upgrade Every Missile Simultaneously
Apply a Double Enhancement
Upgrade Every Weapon Simultaneously
Fire 500 Missile Shots
Reach 1,000 XP
Destroy 1,000 Enemies
Destroy 10 Item Orbs
Collect 10000 Gold - Total