Here is the full list of all 11 Open The Chest 2 achievements.
Open the goblin's chest
Open the fire wizard's chest
Open the chest in the shop
Open the chest in the art gallery
Open the space time chest
North, North, South, South, West, East, West, East, b, a
Open the chest where the wind blows
Open the party chest
Mute, unmute, repeat over and over
The end then the beginning
Breaking hearts