Here is the full list of all 37 Iron Snout achievements. It takes around 6-8 hours to unlock all of the achievements on Windows.
Kill 5000 wolves
Beat 150 wolves in a single fight
Kill 50 enemies in 1HP mode
Kill 25 enemies in 1HP mode
Kill 100 wolves by knocking them to rockets
Kill an enemy with stray rocket
Kill 50 enemies with hats
Kill 100 chainsaw wolves
Kick the same head twice
Get an epic 50 hit combo
Beat 100 wolves in a single fight
Deflect 100 projectiles
Knock off 100 heads
Kill 1000 wolves
Kill 100 rocket-riding wolves
Catch 500 items
Dodge 100 projectiles
Get 250 kills with weapons
Kill 100 pogo wolves
Kill 100 granny wolves
Pop tutorial balloons in less than 5 seconds
Get humped by a mini-wolf
Beat 50 wolves in a single fight
Impale an enemy with tree branch
Put a basket hat on a wolf
Kill 10000 wolves
Hit enemies 25000 times
Beat 200 enemies in a single fight
Knock 3 wolves off their wrecking balls in one game
Beat 50 enemies in a single city fight
Beat 100 enemies in a single city fight
Click on a banner in the main screen
Kill a poke-wolf with his pokeball
Strike skateboarder with his board
Knock enemy shield over the fence
Activate both lamps during a fight
Kill an enemy with a wig