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