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