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