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