Here is the full list of all 24 Hooligan Vasja: Halloween achievements.
Start fighting in Halloween episode
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
Kill 250 Witches
Kill 125 Vampires
Kill 75 Skeletons
Kill 25 Zombies
Kill 15 Grim Reapers
Defeat the Jack-o'-Lantern
Defeat Dracula
Defeat Skull
Defeat Frankenstein's baby
Defeat Hellish Clown
Restore 1000 HP
Manage to die while medikit is nearby
Kill any boss with the last bullet
Do not let a bat to be killed