Here is the full list of all 30 Spy Chameleon - there are RGB Agent achievements.
ONLY ON HARD - Complete all levels with their mission 1 challenges
Change colors one thousand times
ONLY ON HARD - Complete level 10 without changing colors
Complete level 75
ONLY ON HARD - Complete level 63 without eating any flies
Achieve a positive calorie balance
Complete level 60
Annoy the same fish 25 times
Complete the time challenge on 25 levels
Complete level 45
Complete the ladybug challenge on 15 levels
Complete level 30
Complete the fly challenge on 30 levels
Complete level 15
Complete the fly challenge on 15 levels
Complete the time challenge on 5 levels
Complete 5 levels
Complete the fly challenge on 1 level
ONLY ON HARD - Complete all levels and all challenges
ONLY ON HARD - Complete all levels with their mission 2 challenges
ONLY ON HARD - Complete all levels with their mission 3 challenges
ONLY ON HARD - Complete all levels with their mission 4 challenges
ONLY ON HARD - Complete all levels with their mission 5 challenges
Complete the ladybug challenge on 45 levels
Complete the ladybug challenge on all levels
Complete the time challenge on 50 levels
ONLY ON HARD - Complete all levels in less than 18 minutes
ONLY ON HARD - Complete level 24 collecting all the ladybugs in 17.5 seconds
ONLY ON HARD - Complete level 41 without using the button
ONLY ON HARD - Complete level 50 without changing colors