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