Here is the full list of all 35 Ninja Stealth 4 achievements.
Level 30
Level 29
Level 28
Level 26
Level 27
Level 25
Level 24
Level 23
Level 22
Level 21
Level 19
Level 20
Detected by the Motion Detector
Level 18
Level 16
Level 17
Level 15
Level 14
Level 13
Level 12
Detected by the Laser
Level 11
Level 10
Level 09
Level 08
Level 07
Detected by the Security Guard
Level 06
Level 05
Level 04
Level 03
Level 02
Detected by the Camera
Used the box as camouflage
Level 01