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 25 enemies in 1HP mode
Dodge 100 projectiles
Catch 500 items
Kill 100 rocket-riding wolves
Knock off 100 heads
Get 250 kills with weapons
Kill 100 granny wolves
Kill 100 pogo wolves
Deflect 100 projectiles
Beat 50 wolves in a single fight
Pop tutorial balloons in less than 5 seconds
Kill 100 wolves by knocking them to rockets
Kick the same head twice
Impale an enemy with tree branch
Kill an enemy with stray rocket
Get humped by a mini-wolf
Put a basket hat on a wolf
Kill 1000 wolves
Kill 5000 wolves
Kill 10000 wolves
Beat 100 wolves in a single fight
Beat 150 wolves in a single fight
Kill 50 enemies with hats
Hit enemies 25000 times
Kill 100 chainsaw wolves
Get an epic 50 hit combo
Beat 200 enemies in a single fight
Kill 50 enemies in 1HP mode
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