Full list of all 10 Snow Fortress trophies - 5 bronze, 4 silver and 1 gold.
Complete Level 1 of Snow Fort Mode
You threw a snowball at the Fox...
Clear Wave 7 in Survival Mode
Clear Wave 2 in Fortress Mode
Complete Level 9 of Snow Fort Mode
Complete Level 13 of Snow Fort Mode
Clear Wave 7 in Fortress Mode
Clear Wave 15 in Survival Mode
Find the secret Fox level
Complete all levels in Snow Fort Mode