Power Up! Achievement
Obtain any Minikit within 'Retro Wreckage'
There are 10 minkits in the level. You only need to collect one to unlock this achievement. Renting characters can be another way to get one of the minikits faster. You can also enter cheat code "JYJAFX" by pressing to activate the Minikit Detector cheat. Here is a video guide on all minikits in this level: