In the main menu press help/option difficulty set to easy, after play select in the bottom right ultimate survival, wait until 10 000 credit for the minigun buy life if you need, enjoy the achievement
Even if the game is well buildt and the concept is great, the only taste wich left after finishing the hard badge is bitterness, 2 Hours, lot of 999 tries, in the end to frustrating
To much luck based, it would be interesting to have upgrade or something else to avoid a liitle the luck because otherwise it's to much frustating and you just want to quit the game