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