Here is the full list of all 68 Pampas & Selene: The Maze of Demons achievements.
Defeat the demon Cyclops from the platform without touching the ground below.
Defeat the demon Arachne using only mines.
Defeat the demon Moax without stepping on any platform.
Defeat the demon Nephele before it rests for the second time.
Defeat the demon Skorpios without being poisoned.
Defeat the demon Python before it comes out for the 4th time.
Defeat the demon Drakos using only Selene.
Defeat the demon Gorgon without meeting her gaze, double jumping, or using an antidote.
Defeat the demon Kraken using only arrows.
Defeat the demon Pyros without any long-distance fireballs hitting the floor.
Defeat the Lich without taking damage.
Defeat 10 different enemies using their own souls in a single life without loading.
Stay in the air for 19 seconds without using levitators.
Find every secret areas and hidden chests in the game.
Start a new game, obtain five items, and summon a demon without loading or taking damage.
Defeat 6 enemies in less than a second.
Defeat 25 enemies in a row without leaving a levitator.
Defeat the demon Cyclops.
Defeat the demon Arachne.
Defeat the demon Moax.
Defeat the demon Nephele.
Defeat the demon Skorpios.
Defeat the demon Python.
Defeat the demon Drakos.
Defeat the demon Gorgon.
Defeat the demon Kraken.
Defeat the demon Pyros.
Defeat the Lich.
Defeat an enemy using its own soul against it.
Stay in the air for 4 seconds without using levitators.
Just find a hidden chest.
Defeat a demon in a single life without loading.
Defeat 5 enemies in a row without leaving a levitator.
You got scorched by pouring a bucket full of lava on yourself!
Finish the game.
Defeat all 9 mini-bosses in a single life without loading.
Have 1000 arrows.
Have 500 magic power.
Obtain 8 runes in a single life without loading or leaving the demon realm.
Use a soul to defeat a demon.
Find an item that you haven't been asked to find yet.
Find every item in the game.
Complete every quest in the game.
Defeat a demon right before you would be defeated.
Fall to a demon right before it would be defeated.
Defeat 25 enemies with their own souls in a single life without loading.
Defeat yourself carelessly with the explosion of a mine.
Release a fairy and leave it alone so it can escape for a crime it didn't commit.
Find Euterpe, the Goddess of Music.
Defeat a demon without taking any damage.
Obtain the feathers without defeating any of the nearby axeknights.
Defeat 20 jellyfish in a row without letting any escape.
Defeat 10 underwater enemies from outside the water in a single life without loading.
Destroy 10 lava fireballs in a row in the same room.
Slay a demon using only Pampas' sword.
Slay a demon using only Selene's ray.
Visit 10 different rooms with enemies without taking or dealing damage.
Defeat 50 enemies from a ladder in a single life without loading.
Destroy 10 bones in a row thrown by the same skeleton.
Pampas and Selene must level up in the same room before either of them leave it.
Defeat 20 ghosts in a single life without loading.
Eat 10 apples in the same visit to a single room.
Defeat 20 enemies with the spiked helm in a single life without loading.
Stay underwater as Pampas for 14 seconds before coming up for air.
Get 29 items before killing a demon.
Defeat 50 non-demon enemies with your bow without missing an arrow.
Complete all achievements.
Kill 2 enemies in less than a second.