The C-3P-Oh No mission features a total of 3 different mission challenges, this includes Right in the Eye, Be Rey-ly Quiet, and New Orders
MISSION CHALLENGE: Be Rey-ly Quiet
DESCRIPTION: Complete the level without being detected
GUIDE: Another self explanatory challenge. Simply complete the mission without being caught. You can always replay missions if need be, after completing them at least once first. This section basically occurs when you are tasked with following Poe through Kijimi.
MISSION CHALLENGE: New Orders
DESCRIPTION: Peacefully clear the main courtyard of stormtroopers without raising the alarm
GUIDE: This one occurs when tasked with letting the First Order pass or fight them. In this area you will have the ability to find and wear stormtrooper gear, this will help wonderfully with disguising oneself.
Make sure to avoid any spotlights and try to take down enemy troops from behind.
MISSION CHALLENGE: Right in the Eye
DESCRIPTION: Disable a UA-TT’s searchlight with a blaster
GUIDE: You can perform this one when tasked with following Poe in Kijimi. Here you will come across a scene involving the UA-TT. Simply equip a pistol and shoot the spotlight or searchlight. This is probably the most easiest challenge out of the 3 for this mission.