Here is the full list of all 21 Mist Hunter achievements.
Don't die for 15 min. on Hard difficult level
Get at least 100 scores in the Summoning
First Death
Kill 1000 the Mist-corrupted creatures
Kill 100 enemies by using turrets.
Kill 100 enemies while being in the air
Kill 100 enemies by Mist
Don't die for 600 sec.
Kill 20 Witches by the melee weapon
Kill 50 Elite Enemies on Hard difficulty
Kill 20 enemies with exploding boxes
Kill 150 enemies while any power-up is active
Get the first medal in the Summoning
Get 3 medals in the Summoning
Accumulate 10000 scores without taking any HP pick-ups.
Get a secret medal in the Summoning
Kill 20 enemies with any melee weapon
Collect 20 trophies in one game.
Break 1000 objects
Kill 20 Maggots within 120 sec
Kill 10 enemies with explosions