Here is the full list of all 32 SOUTH PARK: SNOW DAY! achievements.
Defeat 10 Vampire Kids.
Revive an ally with a Cheesed Necro.
Use Cheesy Zombies on a Necro.
Toot on an enemy faction leader while dead.
While Invisible, defeat a human boss with a melee attack.
Start a run with someone who has Socially Transmitted Distraction. They say it started in a lab out in California somewhere.
Set 4 or more enemies on fire with no more than 2 seconds in between each.
Finish a map with one extra Rulebook applied.
Find and activate every Rulebook across an entire run, and live to tell the tale.
Defeat Stan within 25 minutes of starting your run.
Damage an enemy in your Event Horizon using your own projectile.
Kill an enemy with an aerial attack after floating with Moon Jump for at least a second.
Kill 3 enemies with cannonballs.
Defeat Cartman without damaging any stationary decoy.
Make at least 4 enemies Vomit with no more than 1 second in between each.
Defeat Mr. Hankey.
Kill 50 Pooplets in one battle.
Dance while reviving an ally.
Defeat Liane at the church.
Defeat Cartman in the foothills.
Increase the rarity of 10 upgrades to Rare or better.
Defeat Stan at the playground.
Become an honorary Marshwalker.
Acquire a Legendary Upgrade.
Defeat Princess Kenny at the Town Square Ampitheater.
Heal 150 points of damage with a single Healing Totem across any number of allies.
Acquire an Ultra-Legendary Upgrade.
Fart on 3 Assassins using Fart Escape.
Defeat Kyle in his sacred grove.
Kill an Ent with Bleeding damage.
Defeat 10 enemies with weapon strikes from the air.
Relieve the buildup of natural pressures in the gastrointestinal tract through quick, albeit semi-musical, bursts of gaseous release.