Here is the full list of all 18 Inferno 2 achievements.
Destroy 250 Shielded Enemies
Destroy 10,000 Enemies
Use a Power 25 Times
Fire 5,000 Missile Shots
Collect 1,000,000 Gold - Total
Reach 10,000 XP
Get Destroyed 5 Times
Destroy 50 Item Orbs
Max Out All Missile Ammo
Upgrade Every Weapon Simultaneously
Upgrade Every Missile Simultaneously
Maximize The Upgrades on a Weapon
Apply a Double Enhancement
Complete 5 Secret Levels
Complete 100 Levels - Total
Complete Every Level On Volcanic
Complete Level 40
Reach The End