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 four deals with the cat in one run
Necromancer saves King
Archer saves King
Collect 46 artifacts
Mage saves King
Collect 3000G in one run
Berserk saves King
Paladin saves King
Make a party!
Collect 15 artifacts in one run
Collect 23 artifacts
Rogue saves King
Find baby
Warrior saves King
Candlevania!
Explode the door
Get Rank C
Get Rank S
Find hidden place
Press TAB in the main menu
Get Rank A
Get Rank B
Die for the first time
Start main Quest