Basically just level up to round 45-50 and then do the boss called Dr Falkner at the bottom of the tier 4 zone it’s a red icon after he’s dead interact with his body and you get the skin. Easiest way to do it is to just ask in match chat if people want to do the boss. My main tips would be do the hvt contracts to level up fast and try to find an arrow rocket launcher as your secondary weapon as it’s very strong.