Here is the full list of all 38 Planet Zoo achievements.
Complete the Zoopedia
All campaign levels completed to a gold standard on hard difficulty
All campaign levels completed to a silver standard on hard difficulty
All campaign levels completed to a bronze standard on hard difficulty
Release 20 critically endangered animals to the wild
Have two different breeds of Elephant born in your Zoo
Complete all campaign levels to a gold standard
Open 25 Franchise zoos
Complete all campaign levels to a silver standard
Complete all campaign levels to a bronze standard
Take part in a community challenge
Open a zoo on every continent
Open a zoo in every biome
Build 10km of barrier
Have an animal in your zoo with a genetic makeup of over 90% in all categories
Have an albino breed
Achieve an Education Rating of 5 Stars
Have a Juvenile Lion be born in a Zoo containing at least 10 species
Build 1km of a tracked ride
Fully train a member of staff
Adopt the retiring Indian Elephants in Scenario 7
Have 73 baby animals born
Repay $50,000 in loans
Have at least 3 Keepers, each with a different roster
Complete the research on one animal in Franchise mode
Open your first Franchise zoo
Build a habitat with 30 animals in it that all have welfare over 75%
Enable all enrichment items in an exhibit
Have an animal reach a 5 star Animal Rating
Have your first baby animal born in your zoo
Place 25 different Enrichment Items
Release your first animal
Gain a gold award in career mode
Gain a silver award in career mode
Have a Lion, a Tiger and a Bear in your Zoo at any one time
Gain a bronze award in career mode
Adopt your first animal
Create your avatar and place them on the globe