How many times I have to beat all 3 levels to get achievement? After second finish of World 3 on difficulty 2 game suddenly has reseted itself to World 1 with difficulty 1 and basic gun.

Achievements do not work at the moment.

I can tell you stole the code from the old GM 8.1 version of Nuclear Throne. They only permit mods and not commercial products using their code of course, so the stolen code is not only unethical but illegal. Your enemies that are holding the rakes behave exactly the way an Assassin would in Wasteland Kings/Nuclear Throne. The camera also behaves the exact same. I bet if I decompiled the game (I am not buying this garbage so I can't) and did a diff comparison, it would find exact matches....