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