03. Challenge: How do we balance needs?
At first, we want to use a history to tell gamers their progress and unlocked achievements in the past game session.
Then we expolored a better way to show any progress increment on an achievement. Later on we simplified the model to just focus on unlocked
and locked achievements.
Another challenge comes from convincing developers which is the right model. As developers had made an early version
of the app with all achievements in one list. They were very reluctant to change anything.