Here is the full list of all 18 Lost In Dungeon achievements.
pick half heart twice
Free a prisoner
Complete 10 levels
Complete 20 levels
Go into the portal
Get a silver key
Get a Golden key
Get a legendery key
5000 gold coins balance
10000 gold coins balance
get a legendary coin
10 legendary coin balance
Place a bomb
Place a freeze bomb
Pick full heart twice
Complete 35 levels
Complete 50 levels
Complete 100 levels