Here is the full list of all 25 Hooligan Vasja achievements.
Defeat the Clownboss
Kill 25 clowns
Defeat the Ratboss
Kill 50 cooks
Kill 5 enemies with one firecracker
Break off a balcony from the wall
Finish a level without incurring any damage
Defeat the Trollboss
Kill 125 neighbors
Kill any boss with the last bullet
Kill 4 enemies with one firecracker
Kill 250 gramps
Defeat the Dogboss
Kill 500 grannies
Restore 1000 HP
Hit 50 cats jumping upon Vasja
Kill 5 enemies with 5 bullets
Defeat the Catboss
Do not let a pigeon to be killed
Kill 3 enemies with one firecracker
Use a firecracker
Manage to die while medikit is nearby
Kill an enemy with falling balcony
Participated in a battle