Zoo Tycoon
44 Achievements
1,000
40-50h
World Heavyweight Champ
Completed 100 challenges.
30
How to unlock the World Heavyweight Champ achievement in Zoo Tycoon - Definitive Guide
jacky rooster
TrueAchievements
TrueAchievements
Assuming you are going for full completion, this will come naturally, but incase you are not the challenges appear on the right hand side by pushing down on the d-pad.
Often challenges will relate to photographing certain animals, having babies etc.
Some of them like 'breeding 3 different types of tigers' are too time consuming for 1 challenge point so stick to the real simple ones, like photography and keeping guests happy for 3 mins etc.
Complete 100 of these and the achievement is yours.
Arsenic, 17
These achievements require that you complete a cumulative total of 1, 25, and 100 challenges across all of your Challenge Mode zoos. Challenges are usually simple tasks which frequently pop-up and must be completed within a given time. You can check your current challenges by pushing 
from within the zoo (while not in any menus). Example challenges include taking a photo of a specific animal, hosing 3 animals, completing a buggy race, releasing or breeding a specific amount of animals, building certain decorations/concessions, and maintaining animals/guest happiness levels for a given amount of time. The whole purpose of Challenge mode is to complete challenges, so you should have no problem getting 100 completed with ease.
Arsenic, 17
These achievements require that you complete a cumulative total of 1, 25, and 100 challenges across all of your Challenge Mode zoos. Challenges are usually simple tasks which frequently pop-up and must be completed within a given time. You can check your current challenges by pushing down on the from within the zoo (while not in any menus). Example challenges include taking a photo of a specific animal, hosing 3 animals, completing a buggy race, releasing or breeding a specific amount of animals, building certain decorations/concessions, and maintaining animals/guest happiness levels for a given amount of time. The whole purpose of Challenge mode is to complete challenges, so you should have no problem getting 100 completed with ease.
