Here is the full list of all 14 No Fear achievements.
Kill 100 monsters
Kill 1000 monsters
Kill 5000 monsters
Kill 20000 monsters
Kill 100000 monsters
Kill 1 mln monsters
Complete the first level
Complete 10 levels
Complete 30 levels
Complete 50 levels
Complete the first level in hard mode
Complete 10 levels in hard mode
Complete 30 levels in hard mode
Complete 50 levels in hard mode