Here is the full list of all 33 Barold: Inferno achievements.
Enter Inferno
Clear Circle 1
Clear Circle 2
Clear Circle 3
Clear Circle 4
Clear Circle 5
Clear Circle 6
Clear Circle 7
Clear Circle 8
Defeat Hell Itself
Talk to eWorm
Talk to Henry
Talk to Howeh
Talk to Mike
Talk to Minus
Talk to NymN
Talk to Owen
Talk to Wesker
Talk to Zoink
Defeat Black Death
Defeat BooBoo
Defeat Bouncer
Defeat Cerberus
Defeat the Devil
Defeat Dragon Deas
Defeat Forzen
Defeat Gothmog
Defeat Hydra
Defeat La'Carra
Defeat Mad Monk
Defeat Pajlinos
Defeat the King of Slimes
Defeat Sophy