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