A lot of the "stealth" missions if you have double jump, maybe some upgrades to increase the time before you are detected, and have a decent amount of health, etc. you can "stealth" them by just moving quickly through the map and disabling the odd camera - usually it is flagged on body count which can be avoided that way as you just shrug off anything attacking you and/or moving too quickly to be detected and sometimes it is flagged on if a camera detects you.
(Most mission won't actually fail you anyhow for not using stealth, just reduces the rewards of which you generally have plenty of).
Stealth I found too tedious to be worth it - too many glitches and bugs, hidden flags/timers, etc. in the stealth mechanics along with some elements of stealth having massive tolerances before you are detected and others such a fine line you struggle to do it by skill.
(Most mission won't actually fail you anyhow for not using stealth, just reduces the rewards of which you generally have plenty of).
Stealth I found too tedious to be worth it - too many glitches and bugs, hidden flags/timers, etc. in the stealth mechanics along with some elements of stealth having massive tolerances before you are detected and others such a fine line you struggle to do it by skill.