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