Super Cloudbuilt
38 Achievements
47-57h
PS4
Ruthless
Kill or stun 10 enemies in 5 seconds or less.
4.7%
How to unlock the Ruthless achievement in Super Cloudbuilt - Definitive Guide
If you are using a Max power Super weapon in any of the skull rated levels, then you will most likely unlock this without trying. Keep in mind that respawning does not reset your kill counter, thus you can abuse this in levels like "Fear":
CarvedWood has reported having issues getting this trophy with the "Fear" respawn strategy and has also provided an alternate location. I have recorded a video using this other location, found in "My Source" from the Maple wing: