Full list of all 43 AMID EVIL achievements. It takes around 12-15 hours to unlock all of the achievements in the base game on Windows.
The base game contains 37 achievements, and there is 1 DLC pack containing 6 achievements.
Find an obscure reference
Finish a level with less than 10 health
Finish a level with full mana
Use a cheat code
Get through a level without killing anything
Don't pickup anything in a level
Rest easy.
Find the hidden developer room
Beat the Abyss
Beat the Arcane Expanse
Experience each type of death
Find Evil Difficulty
Die in the Gateway
Finish a level with no mana
Get all awards in a level
Kill 10 enemies in under 10 seconds with the Axe
Find the idol of the ancient god
Beat the Forges
Destroy all decorations in a level
Kill all enemies in an episode
Beat Solar Solstice
Find all the secrets in a level
Beat the Sacred Path
Banish 10 enemies into a black hole
Use each weapons soul mode attack once
Use the Axe underwater, in soul mode.
Beat Domain of the Sentinels
Blow up the earth
Extend soul mode for 30 seconds
Quit the game
Destroy 5 enemies with a single sun
Beat a level's par time
Beat Astral Equinox
Get 100 Overkills
Read all inscriptions in a level.
Kill all enemies in a level
Finish a level with soul mode on
Find the 3 Developer Artifacts
Beat the Black Labyrinth
Kill 10 enemies with the Void Splitter's soul mode attack
Defeat the Thunder Spirit
Defeat the creature
Kill 15 enemies in under 10 seconds with the gauntlets