Most of them are very illusive and you wonder why you managed to finish the game without getting more than like 1 or 2. 

Это руководство поможет вам получить все достижения в Sonic Mania. 

A list of cheat codes and how to unlock all medals in Sonic Mania Plus 

In this Ultimate Guide for Sonic Mania, you'll learn about how to acess the Developer Menu (Dev Menu) in Sonic Mania, how to get the debug mode and how to control both debug and dev menu. And a few more! More stuff to this guide might be added soon. (Credi... 

esto trata para la gente que quiera platinarse sonic mania 100% español