Here is the full list of all 10 Superfetch Dog achievements.
Reach 50 mph
Swim in the ocean
Reach the canopy
Grab the ball before it touches the ground at level 10+
Knock 3 hives during a single ball fetch
Reach level 30
Get bitten by a snake
Slide full speed under a deer
Reach lvl 20 without eating a single bird
Reach lvl 20 without grabbing any bonus card