Here is the full list of all 24 Princess.Loot.Pixel.Again achievements. It takes around 20-25 hours to unlock all of the achievements on Windows.
Make a party!
Collect 3000G in one run
Necromancer saves King
Berserk saves King
Archer saves King
Collect 15 artifacts in one run
Collect 46 artifacts
Mage saves King
Paladin saves King
Rogue saves King
Candlevania!
Collect 23 artifacts
Warrior saves King
Make four deals with the cat in one run
Get Rank C
Get Rank S
Explode the door
Find baby
Get Rank A
Get Rank B
Find hidden place
Die for the first time
Start main Quest
Press TAB in the main menu