VERY IMPORTANT NOTE: This is the most current guide for this achievement. Digital Extremes has changed some of the levels in the star chart, so the text in BOLD is current.
Cameras in Warframe are present in corpus-focused maps and are solely present to annoy the player during their game. When spotted by these cameras, more enemies will spawn during your gameplay. They are usually located above doorways.
I would recommend Venus! It is very close to Earth (the first planet you play). It also has enemies that are not too tough to defeat.
There were 2 missions that I found were good spots for cameras:
*Ishtar is the best one here since more cameras spawn more consistently
If anything changes, I will keep this guide informed. Thanks to everyone, including Naberios, for letting me know of recent changes.
A great way to destroy a mass amount of cameras is located in Mars (Alator). This is a perfect place for cameras! Happy Hunting!
EDIT: Wes coasn says: Great spot but if your a lower level like myself, the planet Venus (Cytherean) is rated 6-8 whereas is 8-10
This is also really good :D
EDIT 2: This guide will be modified in the coming days. Apparently, the following locations no longer spawn cameras. I will update this as soon as I can!