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