Here is the full list of all 21 Snowballer achievements.
nice
Head first, eyes closed.
shed them more
25 balls thrown
Jägermeister
Thrown 100 snowballs!
OG
Fire Fighter Extraordinaire
Василий Григорьевич Зайцев
Succumbing your desire
Brave
wotchagonnado
For the win!
not borders..
Master Specialist
Some room to breathe
Results in stronger Relationships
You are not supposed to survive this