Full list of all 42 Infernax achievements.
The base game contains 30 achievements, and there is 1 DLC pack containing 12 achievements.
Complete the game as good after turning evil
Up Up Down Down Left Right Left Right....etc
Defeat Paimon again
Leave all the work to Tancred
Listen to Hans' story... ALL OF IT
Travel to the future and defeat Azazel
Complete ultimate evil playthrough
Slay Sir Tancred
Save at all statues after becoming evil
Begin down the path of evil
Complete ultimate good playthrough
Obtain the final weapon
Get the Necronomicon from Robert's cold dead hands
Reflect a projectile and defeat 3 enemies
Summon the tornado
Cleanse the dreamscape
Complete evil playthrough
Complete good playthrough
Complete the game on Classic Mode
Defeat Belphegor, The Father of Destruction
Defeat Apollyon, The Cursed Cherubim
Obtain the final armor
Enter a code in the Game Wizard book
Have Gregor perform an exorcism
Defeat Alastor, The Hope Devourer
Defeat Leviathan, The Sunken Corruptor
Learn the Guided Strike Skill
Defeat 5 enemies with one Thunder/Fire storm
Defeat Kalamon, The Glutton of Pain
Defeat Mahalmon, The Spewer of Lies
Purchase an Evil tool for the Squire
Parade your Duke in any village
Block a projectile with the Squire's shield on the ground
Play a game with a friend... with guns...
Turn around and take the boat
Eat. the. wall. chicken.
Sleep until you can't sleep no more
Complete a game with a friend
Make the Mayor work his core
Take a shortcut to Stormheim Castle's chest
Fully upgrade all the Squire's tools
Purchase the Squire his first tool