Here is the full list of all 21 Little Dog achievements.
Click on "Exit"
Click on "Menu"
Click on "Play"
Reach level 12
Collect 40 bones
Reach level 11
Reach level 10
Jump 100 times
Reach level 9
Reach level 8
Reach level 7
Reach level 6
To be at level 5 for more than three minutes
Reach level 5
Reach level 4
Die 30 times from bat
Die 30 times from cliffs
Reach level 3
Die 25 times from plants
Reach level 2
First level started