Anyone can achieve the rankings. It is simply a reward for being active in their discord server. They do not wish to frivolously dump coins on the market, so in order to qualify, you simply need to chat about the project and crypto in general and be active for 4 days total to reach the minimum rank required to receive free coins as your reward. As you increase your rank by further activity and time, the rewards go up!
This tiered system with requirements ensures that not too many coins flood the market at once and that they only go to those interested in the project and not just random joiners or bots looking for free coins!
Their airdrop system is well thought out and one of the better ones I have seen.