Here is the full list of all 15 Maze Lord achievements.
Killed 50 monster
You need to take 10 coins
Killed 10 monsters
You need to complete 10 levels
Killed 100 monsters
You need to take 50 coins
You need to take 100 coins
You need to complete 50 levels
You need to complete 100 levels
You need to reach 10 experience level
You need to reach 20 experience level
You need to reach 30 experience level
You need to buy 10 artifacts
You need to buy 20 artifacts
You need to buy 30 artifacts