Just Dance 2022

The gift machine can be played for 100 Mojo per reward. The rewards you get are random, but there aren't ever duplicates. You'll need to use the gift machine a total of 200 times to unlock all rewards. At 100 Mojo per use, this equates to 20,000 Mojo to unlock everything and this achievement. This means you'll unlock Ka-ching! (15G) and We Spared No Expense... (30G) along the way to earning this achievement.
 
As far as earning Mojo, there are a few ways to get Mojo:
 

• You'll get 150 Mojo each time you level up.
• You get Mojo for completing challenges, either 50, 100, or 200 depending on the difficulty/length of the challenge.

Since you need to level up to level 100 for What? Already? (30G), and you get 150 Mojo per level, that'll guarantee you 15,000 of the 20,000 Mojo you need just from leveling. That leaves another 5,000 Mojo to obtain.

The only way to earn Mojo (aside from leveling up) is to complete challenges. Refer to The Comeback (30G) for much more information on manipulating the challenges to get easy and fast ones. As noted in that solution, when you complete a challenge, you can close the game app and open it again to get a new challenge. In general, you should never be playing without challenges available to work on, since they give the biggest extra boosts. Since you only need 5,000 Mojo from challenges, it's not a bad idea to keep track of how much Mojo you've gotten from challenges, because as soon as you have 5,000 Mojo from challenges, you can ignore all challenges from then on and just focus on reaching level 100 as soon as possible to get all of the remaining Mojo you'll need.
 
Lastly, the shortest song in the game by far is 'Un Poco Loco.' It's only 1:58 in length, as opposed to pretty much every other song being at least three minutes or even four minutes long. My recommendation is to prioritize that song for whatever challenges you can, because it's so short to run through.