Here is the full list of all 21 Curses 'N Chaos achievements.
Finish a level without using any items.
Defeat 100 monsters in a row with only 1 HP left.
Get a score above 100 000 in the Forest.
Get a score above 100 000 in Bellwood.
Get a score above 100 000 in Wheelwright.
Get a score above 100 000 in the Market.
Get a score above 100 000 in Ovu Cavern.
Get a score above 100 000 in Starfall.
Get a score above 100 000 in Gravefield.
Get a score above 100 000 in Hope's End.
Get a score above 100 000 in Castle Grimm.
Get a score above 100 000 in Grimmalcore.
Collect every item.
Finish a level without taking a hit.
Finish the game.
Get a chain of 200.
Get a chain of 200 in the Chaos Realm.
Raise your money to 50 000.
Kill 2 bird enemies with the catapult.
Defeat a Shark with a Whirlwind.
Use a Potion Plus at full health when your chain is at least 100.