Here is the full list of all 21 Castle of no Escape 2 achievements.
Upgrade an armor with emblems
Allow the phantom to steal 10,000 gold
Always leave any room in 30 seconds
Don't use the crystal orbs
Don't pick up an armor
Don't pick up a shield
Collect the false sword
Complete the game with no damage
Play more than 10 hours
Collect 1,000,000 gold (stackable)
Watch 50 enemies die from traps
Watch 100 enemies die from traps
Exactly this
Collect all the gems and a sword, then use an orb
Don't kill any monsters (including the fallen hero)
Complete the game as a guardian
Complete the game as a huntress
Complete the game as a cardinal
Complete the game as a champion
Complete the game as a bandit
Complete the game as a shamaness