The Winter Wonderland Title update for PAYDAY 2 has 2 achievements.
Complete the Breakin' Feds heist or the Buluc's Mansion heist on the Mayhem difficulty or above in stealth and everyone on your crew dressed in Christmas outfits and masks, without using any pagers. Because nobody has ever seen Santa. Unlocks the "Lightbringer" Weapon Charm.
Get 75 kills with any non-explosive throwable weapon. Unlocks the "Bulbous Bauble" Weapon Charm.