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