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