Zombie Derby 2

If your achievement does not unlock or your 3 star requirements are not fulfilled for whatever reason, try to unlock 3 stars for Level 2 on your FIRST completion of the level. There seems to be a bug when you complete a level without completing all of the requirements. Thank you KandeeRebel for providing confirmation on unlocking this achievement after this glitch may occur. View the comments for more information about the issue.

For this guide, I will be referencing level 1 in this game as this would be the only level (aside from the tutorial) that is necessary to complete to unlock all of the achievements in this game.

This will also most likely be one of the last achievements you unlock as you will need a fully upgraded car (or at least close to fully upgraded). So make sure you have the following achievement before attempting:

The way you earn stars in this game is by:

• Killing all birds in a level (1 for level 1)
• Killing all zombies in a level (110 for level 1)
• Performing a set amount of flips (1 for level 1)

-When it comes to killing the bird, you will need a solid amount of speed and a powered up boost so you can reach the bird's height. You can see me kill the bird at [10:18] in the video below during my 3 star run. This is also a perfect chance to perform a backflip, but I will also mention another opportunity futher on.

-When it comes to killing all zombies, as long as you don't boost over any zombies and you take it slow (basically make sure your wheels touch the ground most of the time), you should be able to kill all zombies. If you want to guarantee a zombie gets killed, take advantage of your guns () and take them out.

-For level 1, there are two chances for you to backflip. I would recommend you ALWAYS backflip. A frontflip seems to be difficult on level 1. The two backflip locations can be seen at [10:18] (after hitting the bird) and [11:00] (after the red bridge) in the video below.

Once all 3 of these objectives are completed, go on to complete the level to earn 3 stars and unlock the achievement!

You will also most likely unlock this achievement at the same time if this is the first time you have completed level 1:

Here is a 100% achievement walkthrough for those that may be interested. I start my 3 star run around [09:37]:
If you give me negative feedback, please PM me or drop a comment. Negative feedback can still be constructive and make this solution better

Can confirm that this achievement is buggy and won't unlock if you already beat a level and tried the same one for the three stars (tried this on multiple accounts).

If you failed to get 3 stars in the first two levels. It would be way easier and quicker to continue unlocking all of the other achievements including finishing all levels, then reset your journey and start from level one again. Cuz getting 3 stars in level 3, 4 or 5 is very tedious.

Now that you have a good experience with the game mechanics, after reseting, start from level 1 again and you will only need to grind some money to fully upgrade the first car, and DO NOT finish the level yet, while grinding always suicide to avoid finishing the level cuz it might happen without your notice.

After fully upgrading your car focus on killing all the zombies, do not miss anyone (1 star) then do a flip in the jump where the bird is flying (two birds one stone) you will get 2 stars for the flip and the killing the bird. Then the achievement will unlock for you at the end of the level for getting the 3 stars.