Here is the full list of all 50 GoFetch achievements.
Adopt Beagle
Adopt Border Collie
Adopt Bull Dog
Adopt Bull Terrier
Adopt Chihuahua
Adopt Doberman
Adopt German Shepherd
Adopt Albino German Shepherd
Adopt Yellow Labrador Retriever
Reno the Rescue Dog
Adopt Black Labrador Retriever
Adopt White Poodle
Adopt Beige Poodle
Adopt Black Poodle
Adopt Pug
Adopt Rhodesian Ridgeback
Adopt Saint Bernard
Adopt all 35 Dogs
Complete map one at least one time on any difficulty setting
Complete map two at least one time on any difficulty setting
Complete map three at least one time on any difficultyy setting
Complete map four at least one time on any difficulty setting
Complete map five at least one time on any difficulty setting
Complete map six at least one time on any difficulty setting
Complete map seven at least one time on any difficulty setting
Complete map eight at least one time on any difficulty setting
Complete map nine at least one time on any difficulty setting
Complete map ten at least one time on any diffuclty setting
Collect 100,000 bones total
Fall into the lava 500 times on map ten
Complete map ten 100 times in a row without falling in the lava
Retrieve 1,000 balls total