Here is the full list of all 15 Escape Master achievements.
Kill 1 guard
Use a Christmas item
Complete the beginner tutorial level
Falling from the platform
Upgrade any character to full level
Clear the game in easy mode
Clear the game in normal mode
Clear the game in difficultyl mode
Drink 50 bottles of mystery potion
Get negative buff twice in a row
Kill 20 guards
Play time is more than 1 hours
Kill 1 robot
Killed one of the hostages
Get a total of 10,000 coins