Here is the full list of all 27 Hooligan Vasja: Christmas achievements.
Start playing game in Christmas mode
Kill 5 enemies with 5 bullets
Break off a balcony from the wall
Kill an enemy with falling balcony
Use a firecracker
Kill 3 enemies with one firecracker
Kill 4 enemies with one firecracker
Kill 5 enemies with one firecracker
Finish a level without incurring any damage
Hit 50 cats jumping upon Vasja
Chase away 250 goblins
Chase away 125 straw scarecrows
Chase away 75 ghosts
Chase away 25 trolls
Chase away 15 daemons
Defeat Gryla
Defeat Hans Trapp
Defeat Babay
Defeat Zwarte Piet
Defeat Krampus
Throw 100 presents
Throw 200 presents
Throw 300 presents
Restore 1000 HP
Manage to die while medikit is nearby
Kill any boss with the last bullet
Do not let a bird to be killed