This Seeking Tech guide will show you how to get the Goud’em! and M-m-muenster Kill! trophy and achievement in Mouse P.I. for Hire.
To do so, you need to do the following:
Goud’em!: “Kill 5 enemies in 10 seconds.”
M-m-muenster Kill!: “Kill 10 enemies in 20 seconds. M-m-muenster Kill!”
You may get most of these naturally when playing the game. It should be easier during the latter parts as there will be more and more enemies attacking you.
Not to mention that you should get more powerful weapons. To make things easier, keep your weapons upgraded whenever possible.
You can check out a video below to see how to unlock both: