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