Guacamelee! 2

For this cheevo you need to collect all five key parts and complete The Crucible before beating the final boss. It doesn't matter if you beat the boss already, because you can always go beat him again. If you complete The Crucible before beating him you will save yourself one boss battle, though. It might be wise to save some upgrades for the Jaguars and for the final boss, because you can heal yourself by leveling up a skill during a battle. Especially if you are playing on Hard.

Collecting the key parts and completing The Crucible isn't the easiest feat but it's doable with some persistence. Below is a video by PowerPyx on how to do it. Good luck!