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