Easy Ways to Get Robits in Robocraft
Ok so time has come for a guide here ! I'm not gonna help you get this achievement, but at least, I'm going to explain how this thing works and try to give some tips to be more efficient towards it.
To earn robits via the CRF, it's depending on other players.
1st step: You need to create a robot, that will be played by others. An efficient one will be best because the chances are people will like your robot and use it more often.
2nd step : Once your robot is done, on the first menu you need to press 
on the robot you want to share, then "Share the robot", then fill the description of the robot, tick the box saying that you're not doing something stupid with their code of conduct blablabla...
And accept !
3rd step : Now comes the part where it's depending on the community. If you have a friend to play this game with, this can be a lot easier. People need to download your creation. Something great is that you can search robots via their name, so you can easily find your friends robots.
4th step : So now, how do you robits earning works. Each time someone completes a battle, it will reward you 500 robits, which is considered 1/100 towards this achievement. But the trick here is = When people download your robot, they're at mastery lvl 1 on it. Every game finished increases its mastery by 1 lvl. Once the robot is lvl 10, it can't reward any more robits to the creator.
So now what ? 5th step : Repeat steps. Build a robot. Share. Get downloaded. Get played. Earn robits.
TIPS :
If you're playing with a friend you're most likely gonna want to do the other achievements related to using the mechanics to move, the weapons to kill, etc.. so for the best efficiency, listen to your friends need to make sure you can help him get his achievements while using your robot.
Also, keep in mind that you're also gonna need this achievement
Which you earn by levelling up your friends robot to lvl 10 (which is 9 games completed)
To resume, basically, people need to use you robots 100 times, and because you can only play the same robot 9 times until it doesn't give robits to it's creator, that is basically at least 12 people using your unique robot or a single person playing with 12 of your robots (or any combination leading to 100 uses considering 9 uses max per robot).
NEW HELPFUL TIP :
To avoid creating useless new robots when you still want/need to use the same, you can duplicate the original from your friend, and level up the copy. Once the copy is lvl 10, erase it, and duplicate again the original one (you have to not use the original to keep it at its lowest level, because the copy always have the same level as the original).
Also, you can take note that you can freely edit the robot you just downloaded to make it fit more your needs, if for example your friend only has the green laser gun, but you have the purple one, you can replace it without changing the fact that the robot will still be considered his own robot !
ANOTHER LAST TIP :
Sometimes it's hard to drive the robot someone else built, and if you don't want to spend some time erasing what your friend just did, you can basically ask him to share a "One Block Only" robot, you download it, you duplicate it to keep it intact (in case you want to build multiple different robots), and then you modify the duplicated block to turn it into whatever you want, and this will still count as his robot ! And if you duplicate the final robot you made before bringing it into battles, you'll have 2 robots, but one of them will still be level 1, which means you'll be able to duplicate and use it forever to still let him earn robits ! So just find a partner to get ready for the whole achievements in this game, and there you go !
And lastly, you might ask : How do I track progress of this ? The achievement only tracks once you get paid robits. To receive your robits, go to the download tab (the robot market), and you'll get a message giving you 500xthe times your robot rewarded you robits. But no worry, if you earn for example 4000 robits, this will count as 8% towards your achievement !
I hope this guide will have enlighten your way to understand this particular mechanic, and it will help you get this achievement more easily now. Don't hesitate to comment if something's not clear and leave a thumbs up if you didn't know before :)
(P.S. Please, excuse my English, I'm French :P)
Source: https://www.trueachievements.com/a250287/mr-popularity-achievement