You launched the game for the first time

You finished the introduction

Keep playing to discover this achievement

You have entered the caves below the wall

You discovered the experimentation room of professor Zopalev

You killed the first boss

You killed the final boss

You finished the game with no death

You finished the game with only one death

You died 10 times

You died 50 times

You died 100 times, great job !

You survived 2 waves in arena game mode

You survived 10 waves in arena game mode

You killed 10 infected

You killed 100 infected

You killed 1000 infected