Here is the full list of all 20 Mr. Sweet achievements.
You unlocked level 7
You unlocked level 6
You unlocked level 5
You unlocked level 4
Collect 10,000 sweetcoins
Buy more characters
Distance = 5000
You unlocked level 3
Buy more music
You unlocked level 2
Distance = 1000
Distance = 500
You unlocked level 8
You unlocked level 9
You unlocked level 10
You unlocked level 11
You unlocked level 12
You unlocked level 13
You unlocked level 14
You discovered a new universe!