Full list of all 45 Let's Build a Zoo achievements worth 1,400 gamerscore. It takes around 80-100 hours to unlock all of the achievements in the base game.
The base game contains 33 achievements worth 1,000 Gamerscore, and there are 2 DLC packs containing 12 achievements worth 400 Gamerscore.
Sell a Hotdog at the worst possible quality.
Own at least 10 buses.
Fire an employee.
Complete 10 trades with other zoos.
Research 20 things.
Map your first Genome.
Create your first hybrid animal.
Have a visit from a protestor.
Build your first Wind Turbine.
Buy a trampoline for your zoo.
Send a member of the black market to prison.
One of your animals must give birth.
Your breeding program must produce 100 babies (nursery births only).
Convince Captain Cola to run a promotion at your zoo.
Build a bacon factory.
Map 56 standard animal Genomes.
Unlock 5 bus routes.
Get a flying visit!
Employ a Gonky mascot.
Sell a ticket for at least 100 dollars.
Complete the trade for the Lion in Singapore.
Have at least 6 unique types of evil factory operating in your zoo.
Earn at least $50000 in a single day.
Sell 10 animal to the black market.
Complete the Goth quests.
Complete all Kaiju Cosplay quests.
Break some teeth.
Research 233 things.
Unlock a second zoo on the world map.
Get a Deco Rating of 100%.
Buy every plot of land in the starting zoo.
Have 200 good points.
Have 200 evil points.
Clone your first dinosaur.
Employ a Bernie mascot.
Build a Bio-waste Storage.
Complete the dig for the Mammoth.
Complete all Critical Choices for King Sapphire.
Discover all 51 Dinosaurs/Animals.
Get first fish from either boat
Create your first marine hybrid
Build a Jeweller
Hire 4 different types of mascots
Get a blue whale
Collect 50 Aquatic Animals